Ilfosol has been out for many years...I think since the early '80s. It was originally called Ilford Universal Film Developer. It's a good, inexpensive, reliable developer. I used it for several years with TMX and Delta 100 rollfilm. I think when people call it "Ilford's Xtol" they're referring to similarities in grain and sharpness rather than similarities in chemical composition of the developers.(posted 8227 days ago)