Correct.
ALL of these chemicals are _supposed_ to be white, with very, very few exceptions.
The brown/tan/yellow is from impurities... the infamous 'amorphous tar' that is the bane of every synthetic organic chemist's existence.
The degree of discoloration varies from batch to batch and chemist to chemist, and has very little to do with how potent the product is, since it takes only a fraction of a % of brown crap to make white powder look disgusting.
Oh I'll remember that then, that does little to narrow down the magic ingredient. As I said I was under the impression you'd nip down to the chemist and get some off-white food colouring (perhaps what some of the branded products do).
There _has_ to be way though! Looking at the synthesis process, could just _any_ chemical slip in and browize it? If it were only a select few, or those which might happen to be around those in the business. Then I guess you don't know what stage at which the brown-ness appeared would you?
I assume a lot of you know how to produce this, and would have an "ingredients list", a bunch of products you'd require to begin the process. Are there any of them which, being off balance or, an entirely new chemical (perhaps accidentally) added to the mix thus making it tan in colour?
You can tell I'm over by depth but I'm trying to fire out ideas that others might catch on to and go

