I left my dial soap at the last albergue. So with some of the travelers I went to a store/super Mercado. I asked one guy, Juo, from Portugal, which soap is which - one for body, the other for clothes. He said that the light one is for body/the darker one for clothes.
We had a few hours more walk so we were separated - his rate is very fast. Just as I got ready to go into the shower, he found me and said, "Padre Tomas! Padre Tomas! - I'm so glad I found you! Reverse It. My mother always got it wrong and washed us with laundry soap all the time! I just figured it out! The lighter one is for the body!!" He had been thinking it over for the last couple of hours. We laughed out loud.