I’ ve been doing bdags for a couple years but only using iodine.
I would like to begin to sensitize with bromine in order to do faster plates for a dag of the moon.
I boght a blister of pure Brome but I don’t know how to dilute it..
I heard that there are some people doing this with silica gel.
Could anyone give me the recipe?
The ratio of 1:40 is most likely for a saturated solution of bromine-water (see this link) further diluted in water. In other words, you have to first create a saturated solution of bromine-water and then dilute this 1:40 with water. Diluting pure bromine 1:40 with water would be very strong.