I have the formula for Nelson's Gold, GP-1, blue /gold etc.
I didn't check my Morgan and Morgan guide for the Ilford It-4 but will do so. I don't think the IT-5 is going to help as it contains thiocarbamide which is found in sepia type toners, However, since i am not a chemist i could be way off balance on that one.
usually one can find the ingredients for various products on the label, not the amounts of course but at least what it contains. Perhaps that is a US thing and isn't universal
thanks for checking your resources for me.