Mastitis Test Solution – this recipe was found at a site that has since been taken down from the Internet. You can see the original page at the Internet Archive.
1 gallon Distilled Water
4 teaspoons Liquid dish Soap like Ivory
1 teaspoon lye (Red Devil)
1 box Navy Rit Dye
Mix completely. To use put 1 teaspoon milk from one teat and 1 teaspoon solution into a plastic quart lid and swirl around. Slimy or curdled means Mastitis. Repeat for other teat.
Reports have been given that this product can be used without the lye. Lye used to be readily available at hardware stores, but has become increasingly difficult to find. It is available online.