I'm getting closer to ordering my chems for the E-6 stuff. The first developer uses phenidone. Can I just sub metol instead? Adjusting by using 10X the amount of metol instead of the phenidone in the formula? Can I use Sodium Borohydride in the reversal bath instead of potassium borohydride? If so what sort of adjustment? edta na 4 is EDTA Tetrasodium?