<< In his Keepers of Light, William Crawford said to use 35.7 grams of
ammonium dichromate in 64.3 ml of water for making the sensitizer. >>
Hmmm.... I didn't use Crawford's formula when I started, so I never paid that
close an attention, but it sounded like a typo for me (I mean, Crawford's
typo, not yours) because I don't know what the final volume of this mix is.
Assuming one reaches 100 ml final volume after the addition of 35.7 grams of
ammonium dichromate, the concentration of this solution would be 35.7%, which
I believe is higher than the saturation point of amm. dichromate, so it can't
be true.