SB-1 is a classic, simple acetic acid stop bath containing a final aceitic concentration of about 1.4 percent. Glacial acetic acid may be diluted to 28 percent by mixing 3 parts of Glacial acetic acid with 8 parts of water. Glacial acetic acid is harmful to skin and respiratory tract. Do not breathe the fumes or allow it to splatter on skin.
REFERENCE
Stop Bath SB-1,
The Negative, Ansel Adams, p.256
Fixers and Stop Baths, Robert Chapman, Chemistry of Photography, p.112