Make Your Own Bluing!

BLUING.

Take one ounce of Prussian blue*, one-half ounce of oxalic acid; dissolve in one quart of perfectly soft rain water. Insert a quill through the cork of the bluing bottle to prevent waste or putting too much in clothes and you will be pleased with the result. One or two tablespoons of it is sufficient for a tub of water, according to the size of the tub. Chinese blue is the best and costs twelve and a half cents an ounce, and the acid will cost three cents.

from The Ladies' Book of Useful Information, 1896.

Bluing is used in many hoodoo spells for purification and protection. It might be poured into bowls of perfumed water and left around the house, added to baths, or in solid form might be carried in mojo bags. It can be bought in stores, or, since the blue color is what's important, it can be substituted with modern blue colored food or cosmetic dyes.

*Prussian blue wouldn't be considered safe for bath/cosmetic use anymore, but cosmetic suppliers will have selections of skin-safe blue pigment of the same color.