Hey,
I have been coating my own glass plates with store bought silver gelatine emulsion successfully for quite some time now and they are working great if developed to negative. But in the past few weeks I have been trying to develop them too positive with partial success. I was using Foma liquid emulsion with Ilford reversal developing instructions that uses PQ Universal and also Dektol as the developer. My main problem is that picture in the first development does not develop all the way to the glass but only on the surface which is not a problem at negative where excess is removed in fixer but it is a big problem at direct positive image. I have tried to heat the glass and coat the plates with thinner layer but then the images where too thin without much contrast. I have tried to dilute the developer to give it more time to the penetrate all the way to the glass without much success. Does anyone have any ideas on what am I doing wrong?
Thanks!
Nejc
I have been coating my own glass plates with store bought silver gelatine emulsion successfully for quite some time now and they are working great if developed to negative. But in the past few weeks I have been trying to develop them too positive with partial success. I was using Foma liquid emulsion with Ilford reversal developing instructions that uses PQ Universal and also Dektol as the developer. My main problem is that picture in the first development does not develop all the way to the glass but only on the surface which is not a problem at negative where excess is removed in fixer but it is a big problem at direct positive image. I have tried to heat the glass and coat the plates with thinner layer but then the images where too thin without much contrast. I have tried to dilute the developer to give it more time to the penetrate all the way to the glass without much success. Does anyone have any ideas on what am I doing wrong?
Thanks!
Nejc