classic cyanotype, whats your formula ?

long time listener, first time caller, thanks for taking my call ...

ive been making cyanotypes for quite a while and haven't settled on a formula for my classic concoction..
i've collected abuncha formulas over the years from the original hershel one ...
to ones that have like x.2 grams of A and x.2 grams of B ... yeah i know, kind of precise !

i know there are people who double coat A and single coat B ( and visy versy )
and others who use 1 or the other ( sorry! i can't remember which )
on the paper for exposure and then coat the other just before washing it off .. lots of different ways to do this fun process !

today i mixed about 6 oz of A and B and i took an average of all the formulas i have LOL it ended up being 36g of A and 16g of B ...
no clue whats going to happen, maybe i should have added the extra 2/10g !!

have you noticed one gives darker blues? one gives less contrast? just got another 1# of FAC from good old artcraft,
so im gonna be making a lot of blue prints !

i'll take my answer off the air, thanks !

john