Quote Originally Posted by srs5694 View Post
I think he means 20 Mule Team Borax. (He'd previously abbreviated this to "Mule crap.") IMHO, a poor choice of abbreviation, particularly for this thread, which began as one on metol/ascorbic acid (aka "MC") developers!
I got tired of repeating 20 Mule Team Borax some time ago, and since the original stuff was pulled out of Death Valley behind a bunch of mules, it seemed appropriate. I call my own batches MCB, so maybe it's a low grade of MC.