Our food grade Citric acid is a colorless and odorless powder with a strong acid taste. It is very soluble in water and alcohol.
Used in foods industry, in some medicine manufacture and in various industrial applications. Also used to improve the etching properties of ferric chloride (Edinburgh Etch process).
Also, popularly used in the making of "Bath Bombs"...
A bath bomb, when placed in bath water, dissolves and effervesces. In some recipes it will add scent, color, and other properties to the water. All recipes call for Citric Acid. As there will be contact with the skin, be sure to use only FOOD Grade or REAGENT Grade Citric Acid.
For much more information, we suggest an article on ehow.com - Go to this link... How to Make a Bath Bomb
And, About.com has an instructional video...