[btreecat]

> But is it always pure when amateurs do it?

Yes. Arguably, because amateurs are not cost bound, they tend to make a less "containinated" product due to the way the collection and blending works.

You discard the foul flavors and harse volatiles that commercial folks keep for cost.

>Can you guarrantee that nothing goes wrong, that the product is tested for contaminations every time?

Life isn't about that kind of guarantee. You don't practice the same level of food safety at home as you're required to maintain in a professional environment.

Life, is about risk acceptance.