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Bath salts are water-soluble, pulverized
minerals In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2 ...
that are added to water to be used for
bathing Bathing is the act of washing the body, usually with water, or the immersion of the body in water. It may be practiced for personal hygiene, religious ritual or therapeutic purposes. By analogy, especially as a recreational activity, the term is ...
. They are said to improve cleaning, enhance the enjoyment of bathing, and serve as a vehicle for cosmetic agents. Bath salts have been developed which mimic the properties of natural mineral baths or
hot springs A hot spring, hydrothermal spring, or geothermal spring is a spring produced by the emergence of geothermally heated groundwater onto the surface of the Earth. The groundwater is heated either by shallow bodies of magma (molten rock) or by circ ...
. Some bath salts contain
glycerine Glycerol (), also called glycerine in British English and glycerin in American English, is a simple triol compound. It is a colorless, odorless, viscous liquid that is sweet-tasting and non-toxic. The glycerol backbone is found in lipids known ...
so the product will act as an
emollient A moisturizer, or emollient, is a cosmetic preparation used for protecting, moisturizing, and lubricating the skin. These functions are normally performed by sebum produced by healthy skin. The word "emollient" is derived from the Latin verb ''mo ...
, humectant, or
lubricant A lubricant (sometimes shortened to lube) is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, t ...
. Fragrances and colors are often added to bath salts; the fragrances are used to increase the users' enjoyment of the bathing experience.


Description

Substances often labeled as bath salts include
magnesium sulfate Magnesium sulfate or magnesium sulphate (in English-speaking countries other than the US) is a chemical compound, a salt with the formula , consisting of magnesium cations (20.19% by mass) and sulfate anions . It is a white crystalline solid, ...
(Epsom salts),
sodium chloride Sodium chloride , commonly known as salt (although sea salt also contains other chemical salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g ...
(table salt),
sodium bicarbonate Sodium bicarbonate (IUPAC name: sodium hydrogencarbonate), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3. It is a salt composed of a sodium cation ( Na+) and a bicarbonate anion ( HCO3−) ...
(baking soda),
sodium hexametaphosphate Sodium hexametaphosphate (SHMP) is a salt of composition Na6 PO3)6 Sodium hexametaphosphate of commerce is typically a mixture of metaphosphates (empirical formula: NaPO3), of which the hexamer is one, and is usually the compound referred to by t ...
(Calgon, amorphous/glassy sodium metaphosphate),
sodium sesquicarbonate Sodium sesquicarbonate (systematic name: trisodium hydrogendicarbonate) Na3H(CO3)2 is a double salt of sodium bicarbonate and sodium carbonate (NaHCO3 · Na2CO3), and has a needle-like crystal structure. However, the term is also applied to a ...
,
borax Borax is a salt (ionic compound), a hydrated borate of sodium, with chemical formula often written . It is a colorless crystalline solid, that dissolves in water to make a basic solution. It is commonly available in powder or granular form, ...
, and
sodium citrate Sodium citrate may refer to any of the sodium salts of citric acid (though most commonly the third): * Monosodium citrate * Disodium citrate * Trisodium citrate The three forms of salt are collectively known by the E number E331. Applications F ...
.
Glycerin Glycerol (), also called glycerine in British English and glycerin in American English, is a simple triol compound. It is a colorless, odorless, viscous liquid that is sweet-tasting and non-toxic. The glycerol backbone is found in lipids known ...
, or liquid glycerin, is another common ingredient in bath salts. Depending on their properties, the additives can be classified as
emollient A moisturizer, or emollient, is a cosmetic preparation used for protecting, moisturizing, and lubricating the skin. These functions are normally performed by sebum produced by healthy skin. The word "emollient" is derived from the Latin verb ''mo ...
, humectant or
lubricant A lubricant (sometimes shortened to lube) is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, t ...
when used in bath salts products. Fragrances and colors are often added to bath salts; in fact, one purpose of salts is as a vehicle or
diluent A diluent (also referred to as a filler, dilutant or thinner) is a Concentration, diluting agent. Certain fluids are too Viscosity, viscous to be pumped easily or too density, dense to flow from one particular point to the other. This can be prob ...
to extend fragrances which are otherwise too potent for convenient use. Other common additives to bath salts are oils (agglomerating the salts to form amorphous granules, the product being called "bath beads" or "bath oil beads"), foaming agents, and effervescent agents. Bath salts may be packaged for sale in boxes or bags. Their appearance is often considered attractive or appealing, and they may be sold in transparent containers, showing off, for example, the needlelike appearance of
sodium sesquicarbonate Sodium sesquicarbonate (systematic name: trisodium hydrogendicarbonate) Na3H(CO3)2 is a double salt of sodium bicarbonate and sodium carbonate (NaHCO3 · Na2CO3), and has a needle-like crystal structure. However, the term is also applied to a ...
crystals.


History

The earliest systematic exposition of the different kinds of salts, their uses, and methods of extraction was published in China around 2700
BCE Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the or ...
.
Hippocrates Hippocrates of Kos (; grc-gre, Ἱπποκράτης ὁ Κῷος, Hippokrátēs ho Kôios; ), also known as Hippocrates II, was a Greek physician of the classical period who is considered one of the most outstanding figures in the history of ...
encouraged his fellow healers to make use of salt water to heal various ailments by immersing their patients in sea water. The ancient Greeks continued this, and in 1753 English author and physician Charles Russel published "The Uses of Sea Water".


Effects

Some bath salts such as
phosphates In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid . The phosphate or orthophosphate ion is derived from phosph ...
have a detergent action that softens calloused skin and aids in exfoliation (cleaning off dead skin cells). Some bath salts act as
water softeners Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extend ...
and change the way
soap Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are use ...
rinses. Some confusion may arise for bathers after their first experience in a bath with
soft water Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, which are largely made up of calcium and magnesium carbonates, bicarbo ...
. Soap does not lather well with
hard water Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, which are largely made up of calcium and magnesium carbonates, bicarbo ...
and can leave a sticky feeling. Soft water lathers better than hard water but feels slippery for a longer time during rinsing of soap, even though the soap is coming off faster, because the soap remains soluble. High concentrations of salts increase the
density Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematical ...
of the water and increase
buoyancy Buoyancy (), or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the p ...
, which makes the body feel lighter in the bath. Very high concentrations of salts in water are used in many
isolation tank An isolation tank, sensory deprivation tank, float tank, float pod, float cabin, flotation tank, or sensory attenuation tank is a water filled, pitch-black, light-proof, soundproof environment heated to the same temperature as the skin, developed ...
therapies. Isolation tanks are special baths with enclosures which block out all light. Researchers have also studied their use in treating
arthritis Arthritis is a term often used to mean any disorder that affects joints. Symptoms generally include joint pain and stiffness. Other symptoms may include redness, warmth, swelling, and decreased range of motion of the affected joints. In som ...
.


Bath fizzies

Bath fizzies are material products designed to effervesce in bathwater. They come in the form of amorphous grains of homogeneous mixture, packaged in a box, jar, or envelope; single-use envelopes of mixed powders; and solid boluses of homogeneous or inhomogeneous mixture called
bath bomb A bath bomb is a consumer product used during bathing. It was invented and patented in 1989 by Mo Constantine, co-founder of Lush Cosmetics. It is a compacted mixture of wet and dry ingredients molded into any of several shapes and then dried. B ...
s. Bath fizzies are a form of bath salts in that the products of their use include a salt solution in addition to the carbon dioxide bubbles which are their definitive feature. Their ingredients must include one or more acid(s) and one or more water-soluble bicarbonate, sesquicarbonate, and/or carbonate. In addition they commonly include coloring, fragrance, and/or other water-soluble, water-dispersible, and/or volatile ingredients for esthetic, cosmetic, or skin soothing purposes. This principle of effervescing while releasing other ingredients is the same that has been used by tableted products for children to produce their own carbonated beverages.


Fake products used to disguise drugs

To evade drug laws, some companies sell a number of powdered
recreational Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or pleasure ...
designer drug A designer drug is a structural or functional analog of a controlled substance that has been designed to mimic the pharmacological effects of the original drug, while avoiding classification as illegal and/or detection in standard drug tests. Des ...
s in packages labelled "bath salts" . The name derives from instances in which the drugs were sold disguised as true bath salts, with the package claiming that the chemical was intended for use during bathing. The white powder, granules, or
crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macros ...
s often resemble true bath salts such as
Epsom salts Magnesium sulfate or magnesium sulphate (in English-speaking countries other than the US) is a chemical compound, a salt with the formula , consisting of magnesium cations (20.19% by mass) and sulfate anions . It is a white crystalline solid, s ...
, but are very different chemically. The drugs' packaging often states "not for human consumption" in an attempt to circumvent
drug prohibition law The prohibition of drugs through sumptuary legislation or religious law is a common means of attempting to prevent the recreational use of certain intoxicating substances. While some drugs are illegal to possess, many governments regulate the ...
s. These fake bath salts are mainly sold in shops selling
drug paraphernalia "Drug paraphernalia" is a term to denote any equipment, product or accessory that is intended or modified for making, using or concealing drugs, typically for recreational purposes. Drugs such as marijuana, cocaine, heroin, and methamphetamin ...
such as
head shop A head shop is a retail outlet specializing in paraphernalia used for consumption of cannabis and tobacco and items related to cannabis culture and related countercultures. They emerged from the hippie counterculture in the late 1960s, and ...
s.


Emollient bath additives as an eczema treatment

In 2018, a study of 483 children commissioned by the
National Institute for Health and Care Research The National Institute for Health and Care Research (NIHR) is the British government’s major funder of clinical, public health, social care and translational research. With a budget of over £1.2 billion in 2020–21, its mission is to "impr ...
(NIHR) and published in ''
The BMJ ''The BMJ'' is a weekly peer-reviewed medical trade journal, published by the trade union the British Medical Association (BMA). ''The BMJ'' has editorial freedom from the BMA. It is one of the world's oldest general medical journals. Origi ...
'', found that bath oils used to help treat
atopic eczema Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin (dermatitis). It results in itchy, red, swollen, and cracked skin. Clear fluid may come from the affected areas, which often thickens over time ...
in children offered "no evidence of clinical benefit".


See also

*
Balneotherapy Balneotherapy ( la, balneum "bath") is a method of treating diseases by bathing, a traditional medicine technique usually practiced at spas. Since ancient times, humans have used hot springs, public baths and thermal medicine for therapeutic e ...
*
Bubble bath A bubble bath is a filled bathtub with a layer of surfactant foam on the surface of the water and consequently also the surfactant product used to produce the foam or soap. Less commonly, aerated or carbonated baths are called ''bubble baths''. ...
*
Heubad Heubad () is an Austrian traditional hay bath with more than 200 years of history. Bathers immerse themselves in hay which releases heat from biodecomposition. Information Heubad was ostensibly discovered by a tired field worker who, after rest ...
*
Mud bath A mud bath is a bath of mud, commonly found in areas where hot spring water can combine with volcanic ash. Mud baths have a long history that dates back thousands of years. Mud baths are conceived as public bathing spaces created in open areas ...
*
Sea bathing The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Se ...
* 2-Aminoindane


References


External links

* {{wiktionary inline, bath salt Aromatherapy Balneotherapy Bathing Skin care
Bath Salts
in Research Chemicals