Decaf, and the one hard number in this property
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The number
Methylene chloride is permitted as a solvent in the decaffeination of coffee at a level not to exceed 10 parts per million, which is 0.001 percent, in decaffeinated roasted coffee. That is one of very few hard federal figures that touch this property at all.
You almost certainly are not doing it
Decaffeination happens to green coffee at specialist facilities, so a roaster buys decaffeinated green and roasts it. The process, and therefore the claim about it, belongs to somebody upstream and you are repeating it.
Which process matters to buyers
Solvent-based and water-based processes both exist, and a substantial number of customers care which was used. If you name a process on the label you are making a claim about a facility you have never seen, so it needs documentation against the lot like any other origin claim.
Decaf roasts differently
Decaffeinated green behaves differently in a roaster: it often colors faster and gives less reliable visual cues, so a profile built for regular coffee will not transfer. Treat it as a separate profile rather than a variation.
It has a shorter practical life
Many roasters find decaf stales faster, which makes it a difficult product to carry in small volume: it sells slowly and declines quickly. That is a real tension and the usual answer is small batches, roasted often, in small formats.
Say what it is plainly
Decaffeinated rather than caffeine-free, because the processes reduce caffeine rather than eliminate it entirely. The distinction matters to somebody avoiding it for medical reasons, and it is an easy claim to overstate.
Carry it even though it is awkward
Decaf sells slowly and goes off quickly, which makes it the product a small roaster is most tempted to drop. Dropping it loses the whole household when one person in it drinks decaf, and that is usually worth more than the stock written off.