anybody toning prints for jet black

soon will be making my own bromide and chloride emulsions .been studing amidol techniques and glycin from books over 70 years old. my interest is salon prints. will produce museum size murals on canvas up ,up to 42 x 70 inches as that size i can ship to museums by bus instead of UPS. my lab is set up to do big work. everything i have is homemade even my 12x 14 inch glassplate camera. would like to exchange ideas with other practicing practitioners of glassplate and techniques they use in their lab to arrive at jet black prints .i am familar with bromide and chloride techniques with amidol ,glycine, and metol ,and hydroq with glycin.