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Hello. I have been using the Speedball Diazo emulsion on and off for 15 years to a high degree of success. I recently bough a new bottle of the emulsion and sensitizer. I mixed the two as usual and then BAM.. the PROBLEM APPEARED. In the past the mixture was BLUE before adding sensitizer, and would turn to a sort of green after mixing the two, and then after drying and exposing the parts that get washed out would be a light green, and the hardened areas a darker green.

MY ISSUE... after mixing the TWO parts, the mixture never turned green as I had in the past. I had not used it in a couple years and thought maybe they changed the formula so it doesn't turn green. This was from brand new and unopened product?? any clues
thanks,
nick
 

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Hey,

Crazy how your thread lasted since 2013, I have the same problem, but there was already a problem before, when I opened the diazo bottle, the black liquid was hardened, I tried multiple way to make it solve but when I would attempt to pour it in the photo emulsion, it would've not turn green. Why ?

Notice that I used approximatively almost a 100 euros on emulsion and I still don't fin a way to solve this.
 
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