High contrast silver chloride emulsion (Mikhailov)

[thio]

This formula was invented by russian photo-chemist and engineer V.Y. Mikhailov (Emulsion Laboratory, NIKFI) and published in 1938. It was derived and improoved from Steigmann formulas the same years.

High contrast silver chloride emulsion (Mikhailov, 1938).

Solution A:
Water - 3000 ml
Sodium chloride - 64.2 g
Cadmium chloride (hydrate?) - 3 g
Gelatin - 80 g
Blood albumin (2% solution) - 12 ml

Solution B:
Water - 750 ml
Silver nitrate - 100 g

Heat both solutions to 70C, mix rapidly and cool to 60C immediately. Ripen at this temperature for 20 min. Add 330 g gelatin and 50 ml 2% albumin and ripen more for 10 min. Add 800 ml water (60C) and finally ripen for 10 min. Cool to the coating temperature and coat it on baritaged paper ASAP.
Coating finals - common ones.
Loading - 150 ml per 1 m2 (ca. 1.9 g silver metal per 1 m2).

Paper properties:
Speed - 180 - 300*
Gamma (1 min developing) - 3.2 - 4.0
Fog density (1 min developing) - 0.01 - 0.03

* speed was calculated from exposure H(g) for minimal gradient g=0.2 as S = 10000/H.

Emulsion can be stabilized by conc. hydrochloric acid (5 ml per 1 L) addition - added after 30 min of ripening.

 

[minh0204]

Blood albumin (2% solution) - 12 ml

What is blood albumin? Human blood???

 

[thio]

Albumin (albuminoids actually) is a protein from amnimal blood or eggs. You can use the blood of your enemy
Actually Steigmann and Agfa used egg albumin for the emulsions.

 

[Peter Schrager]

is there anyone who has tried this formula??

 

[grain elevator]

Probably not recently, seeing that it calls for cadmium...

 

[Peter Schrager]

Probably not recently, seeing that it calls for cadmium...

It's using cadmium chloride which is available
I sent a message to op to see if he actually used the formula

 

[removed account4]

Peter if not, look into the sea water emulsion ( you can use water and salt if you aren't near the water ) on the light farm site
super easy lots of fun, gas light hard core silver chloride .. no blood albumin though, I guess you'll have to find some enemies

 

[thio]

is there anyone who has tried this formula??

Hello, Peter!
I have not tried this formula. But I belive this formula is workable. Of course contrast and sensitivity will depends on the gelatin greatly.

 

[Peter Schrager]

Hello, Peter!
I have not tried this formula. But I belive this formula is workable. Of course contrast and sensitivity will depends on the gelatin greatly.

I may try this but will have make only 25% of the ingredients..one could lots of paper with the original formula!

 

[Nodda Duma]

Agree with above that this greatly depends on the gelatin. I bet the blood albumin helps with sensitivity. The cadmium tweaks the contrast.