batesga
Allowing Ads
- Joined
- Aug 2, 2006
- Messages
- 12
- Format
- 4x5 Format
I had looked for information to help me mix a developer to attain high contrast with litho film. Contrast of the graphics art range, like drop out negatives or line work negatives. I found useful information that helped me come up with an easy make solution that worked very well with Arista-II Ortho Lithographic film. It has no formaldehyde.
solution A
400 ml water hot like 110F
4 grams Sodium Sulfite
8 grams Hydroquinone
5 ml 10% potassium bromide solution
Solution B
a 10% solution of Tri-Sodium Phosphate
500 ml hot water
50grams TSP
add and dissolve in order
I used a working solution of 100 ml solution A mixed with 60 ml of solution B.
I measured the solutions in separate containers and waited to pour into a tray immediately before putting in the exposed film. I developed with plenty of agitation for a minuet and a half, half a minute in a weak stop bath and 3 minuets in T4 print fixer. A stronger fixer may be better but this is what I had and the film cleared quickly and is fine. Density is .05 in open and above 3.3 in opaque areas and hard edges. I imagine the working solutions might exhaust quickly with the TSP content. I mixed new working solution for each film I processed, 8x10 by the way.
In short, worked great for what I needed and uses pretty basic chemistry so I figured someone else might find it handy if needing a line negative or two.
solution A
400 ml water hot like 110F
4 grams Sodium Sulfite
8 grams Hydroquinone
5 ml 10% potassium bromide solution
Solution B
a 10% solution of Tri-Sodium Phosphate
500 ml hot water
50grams TSP
add and dissolve in order
I used a working solution of 100 ml solution A mixed with 60 ml of solution B.
I measured the solutions in separate containers and waited to pour into a tray immediately before putting in the exposed film. I developed with plenty of agitation for a minuet and a half, half a minute in a weak stop bath and 3 minuets in T4 print fixer. A stronger fixer may be better but this is what I had and the film cleared quickly and is fine. Density is .05 in open and above 3.3 in opaque areas and hard edges. I imagine the working solutions might exhaust quickly with the TSP content. I mixed new working solution for each film I processed, 8x10 by the way.
In short, worked great for what I needed and uses pretty basic chemistry so I figured someone else might find it handy if needing a line negative or two.
