I thought I'd try 6% in Sodium Sulfite in Rodinal just to see what happens. So I got 1 lb of Lauder SF ("photo grade"), mainly because it was $6.50 and the Kodak 1lb bottle was $8.50. Yeah, I'm cheap! The Kodak one spells out that it's Anhydrous, but the Lauder one doesn't say. If it's monohydrous, does that mean it's half water by weight, or that there's a 1:1 SSF-to-H2O molecular ratio and the weight ratio is in relation to their molecular weights? (Sorry if this sounds silly, but I haven't spent a single attosecond thinking about chemistry since high school 20 years ago.) I would guess the SSF is a much larger molecule and many times heavier than water. Basically, are they the same thing, or should I use twice as much of the Lauder for the same W:V ratio, or something inbetween? Also, I don't have a scale, is there a way to convert SSF weight to volume? E.g. if it's 1.5x the weight of water, I'd use 6%/1.5 by volume which would be pretty easily measured by displacement. I do understand that the measurement isn't critical, but I'd like to have a method to the madness.