I have tried the Barry Thornton technique in bleaching and found it to work very differently on different types of papers. It seems to work better on Ilford single contrast fiber paper better than othes - (I think that is what Barry uses) When used on Forte single grade fiber paper (like I use) it turns the paper very brown when using the bleach. I wtill think I need to practice it but the theory is sound and it does improve some difficult images