Well, I once put too much brown color (I think) in a chocolate mint soap I made, and I also added some cocoa. My lather was brown!
And in another soap (m&p) I tried to do a swirl by adding colorant and swirling it in and I ended up with purple lather! Maybe I used too much?
I understand how it would wear down, being it's superficial, and not all the way through the soap, and I thought 'bleeding' was just a m&p issue? So I'm not too sure what it's called when your lather isn't white but is affected by your colorants? Hope I'm explaining this right...