You’ll need the following items to complete this lab session. (The standard kit for this book, available from http://www.thehomescientist.com, includes the items listed in the first group.)
Gentian violet solution, 0.1% aqueous
Plastic sheet, transparent (optional; see text)
Specimens: sticky with latent fingerprints
Gentian violet solution stains anything it contacts. You can remove stains from your skin and some materials using ethanol or isopropanol. Some fabrics may be stained indelibly. Wear splash goggles, gloves, ...