McFortner
Member
Yelled at each other in person? 
Michael

Michael
What did we all do before online forums?
What did we all do before online forums?
I'm confused. What is food grade chemistry?
I would assume that food grade would be that which would be normally used in the preparation of food products. Medical grade would be that used in the preparation of medical products like drugs. While we often use the term for that available in the grocery store, not all grocery store products are food or medical grade. For example household bleach which is chlorine in solution is still toxic, so it would not be food grade.
I'm confused. What is food grade chemistry?
The SPSE Handbook lists purity specifications for photographic chemicals.
"+30" what?
Upon thinking about it some more, I'll bet it's a particle size analysis, and the "+30" refers to the fraction/percentage that is retained on top of a #30 sieve. That is, the percent that is "+" or above the #30 sieve.
A #30 sieve has square metal mesh with openings that are 0.595 mm in size.
+30.......1%
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