Quote Originally Posted by gainer View Post
The onset of my interest in purifying borax was instigated by the assertion, made by PE and Kirk Keyes, that the 20 Mule Team borax from the supermarket is not pure enough for photo work, even though many of us have been doing so for years.
To set the record straight, I suggested that 20 Mule Team may contain impurities that would interfere with photgraphic uses, and that photo-grade borax gives one some assurance that your reagents are suitable for photographic uses.