Is sodium percarbonate artificial? If I add sodium percarbonate to my natural laundry soap recipe, can I still claim "No Artificial Anything"?
I know it's used in many "natural" products, but is it considered an "artificial ingredient"?
I don't want to make any false claims with my product.

thank you!
Yes, it is artificial. Sodium carbonate is a substance that occurs in nature, even though any of it is most likely manufactured.

Sodium percarbonate, on the other hand, does not occur in nature and it has to be manufactured. It is an oxidiser, and oxidisers don't occur in nature normally. That's a problem for you, because oxidisers (aka bleach) are desired in laundry applications.