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A recipe in Caldwell book calls for ST50----I can find no info on this----does anyone no anything about this or a similar replacement?
Qdog

TA50 maybe? it contains ST.

http://www.glengarrycheesemaking.on.ca/starters-and-cultures/lactic-starters/lactic-starters-from-danisco/danisco-choozit-ta050-125-dcu.html

That was my first thought as well. It is a slower-acidifying thermo variety.

Which recipe?

That's what I'm thinking, too---it might be a misprint, or just her terminology----because in another section she discuses TA 50 as a slow acidifier----the recipe is for Flor Azul, a blue cheese.
Qdog

If you scroll through to the "LARGE BATCH GUIDELINES" She changes that to TA-50.  I would say the ST-50 was a misprint.

Thanks Al---didn't notice that. Expensive stuff for a 1/16th tsp.
Qdog

Al: Good detective work! :-)