The name<unk>  is applied to a range of soluble, usually inorganic solid products designed to be added to a<unk> , either to improve cleaning, provide a medical improvement, to improve the experience of<unk> ing, or to serve as a vehicle for cosmetic agents.
Such<unk>  include:
magnesium sulfate (Epsom<unk> 
sodium chloride (table<unk> 
sodium bicarbonate (baking soda)
sodium hexametaphosphate (Calgon, amorphous/glassy sodium metaphosphate)
sodium sesquicarbonate
borax
Although many organic substances commonly used in or with<unk>  water are<unk>  (such as soap and many other surfactants), these are not usually called<unk> ".  However, this does not rule out the possibility of low formula weight organic<unk>  such as sodium citrate being called<unk> .
As with the naming of other additives, mixed preparations consisting largely though not entirely of<unk>  as described herein may be called<unk> ".  Commonest additions are fragrances and colors, and one purpose (in some products the most important one) of<unk>  is as a vehicle or diluent to "stretch" fragrances, which are otherwise often too potent for convenient measurement or use.  Other common additives to<unk>  are oils (agglomerating the<unk> , the product being called "bath beads" or "bath oil beads"), foaming agents, and fizzing (effervescent) agents.
The appearance of the product before use is sometimes valued, and although<unk>  are often packaged for retail in windowless boxes or bags, they may also be displayed in transparent containers.  For instance, the needlelike appearance of sodium sesquicarbonate crystals makes them attractive for such purpose.  However,<unk>  may also be prepared as amorphous granules rather than crystals.
Bath salts
Gold salts
Protic solvent
Detergent
Colloid
Methanol
Dichloroacetic acid
2-Methyl-4-Chlorophenoxyacetic Acid