I don't think that it darkens. Can anyone answer that? I know that Soapwort doesn't.

It was funny, I was shopping online and comparing prices, and trying to decide which place to order my soapnuts from, and my DH said, "Why don't you look on Amazon? They have everything!" And I said, "Oh, I'm sure they wouldn't have it, it's something you have to get at Indian grocery stores." He said, "Try it!" And you know what, he was right! Amazon.com sells soapnuts!