It is decomposed by heat into oxide, nitrogen peroxide and oxygen; and is used for the manufacture of fusees and other deflagrating compounds, and also for preparing mordants in the dyeing and calico-printing industries.
Ferrous and ferric acetates are used as mordants; normal lead acetate is known in commerce as sugar of lead; basic copper acetates are known as verdigris.
Thus the protoand per-salts of iron, as well as the protoand per-salts of tin, including also a large variety of tannin, sumac, divi-divi, chestnut, valonia, the acacias (Areca Catechu and Acacia Catechu from India), from which are obtained cutch and gambier, &c., are no longer used solely as mordants or tinctorial matters, but mainly to serve the object of converting the silk into a greatly-expanded fibre, consisting of a conglomeration of more or less of these substances."
Gum tragacanth is used in calico-printing as a thickener of colours and mordants; in medicine as a demulcent and vehicle for insoluble powders, and as an excipient in pills; and feltsetting and mending beetles and other insect specimens.
If the fabric is dyed, then this is likely to have been done with natural dyes, although organic consumers should note that even many natural dyes use chemical mordants to fix the dyes.