sunderwood wrote: Where did you read that about an enzymatic record cleaner being good for only two hours after it is mixed?
It's on the back of the Sporicidin bottle under directions for use. Plus, this was confirmed to me by an aminologist who's payed very well to know this stuff. In its concentrated form, the pH is too high (or too low...I forget) for the enzymes to become viable. Once diluted with water in the correct proportion, they become viable and begin to break down the tissues they target....including the proteins they're made of....hence, the 2 hour window.
Besides, has it occurred to you why there would be mold growing in a bottle of enzymes that are intended to break down and destroy mold tissue, if the enzymes are still viable?
As to the commercial preparations...no comment, but I have the Walker record cleaner kit, which includes a bottle of enzymes in powder form. Expensive stuff (it was a gift)...and it's probably just papain or bromelain lol.