Chrome Alum Stop Bath Kodak SB-3
This chrome alum stop bath provides greater hardening than can be obtained
with a white alum stop bath or fixer.
Use full strength. Agitate continuously for the first 30 to 45 seconds to avoid streaking. Allow the film to remain in the bath for 5 minutes with agitation every minute.
This stop bath rapidly loses its hardening ability and should be made up fresh
before use. A fresh bath exhibits dichroism such that it appears purple by reflected light and green by transmitted light, discard it when it turns green.
This stop bath is useful with soft emulsions like Efke.