Cobalt toner formula

[SadChi]

Hello,

Recently I've found some interesting pictures over the net that was toned with cobalt. That resource doesn't give formula because it sells ready made toner. Maybe some of you know how to prepare cobalt toner, please share the knowledge.

Regards, Alexey.

[cobalt]

You are trying to steal my formula, eh? Eh???

:-)

I just had to...
But seriously, in painting, cobalt is used to create some of the best pigments, cobalt blue, for example. It is toxic, as is cadmium. Don't know much else about this.

[Andrew O'Neill]

Can you give me some more info about how the prints looked? Were the whites, white or did they also have a cobalt tone to them?

[SadChi]

Can you give me some more info about how the prints looked? Were the whites, white or did they also have a cobalt tone to them?

Andrew,

Here is the link:

http://www.moersch-photochemie.de/daten/tonung-kobalt/anleitung_kobalt_eng.htm

Regards.

[Andrew O'Neill]

Thanks for the link. Interesting read.

[Jim Graves]

Here's the link for ordering ... don't know if they ship to the U.S. ... 40 Euros for the kit + 19% tax ... WOW and we think we have high sales taxes in California!!

http://www.lumiere-shop.de/product_info.php?info=p4865_MT-12-Kobalttoner-Kit.html

[Ole Tjugen]

Most metal toners are fairly similar, so replacing whatever iron salt is used in your favorite iron blue toner with cobalt (III) chloride should be a good place to start.

The Colorvir kits contain zinc, iron and titanium toners of this same basic type; copper and vanadium toners are very similar. You can try nickel as well, and several other metals might be interesting.

[IanG]

Somewhere in the UK I have a Cobalt toner formula, I have also used a Cadmium toner for white tones.

Ian

[al olson]

Steve Anchell's Darkroom Cookbook, 2nd edition, has two cobalt formulae:

Light Green Toner (the longer the bleaching, the lighter the green)
Cobalt Chloride-----20 grains-----1.3 grams
Ferrous Sulfate----- 5 grains-----0.3 grams
Hydrochloric Acid---20 minims----1.2 ml
Water-------------- 2 minims---60.0 ml

Emerald Green Toner
Cobalt Chloride-----20 grains-----1.3 grams
Ferrous Sulfate----- 5 grains-----0.3 grams
Glacial Acetic Acid--30 minims----1.8 ml
Water-------------- 2 minims---60.0 ml

I don't know anything about units in "minims" or how they are supposed to convert to ml, but there seems to be a conflict in the conversion between minims and ml. Furthermore, there is no mention as to dilution factors which would be necessary because 60 ml is too small for a working solution.

Perhaps this will be cleared up in the third edition.

[Chuck Peacock]

In the USA, Freestyle carries this stuff for $72.99.

There's also a fairly nasty MDB sheet that states "A hazard for drinking water sources when only small quantities get into groundwater."

Neat looking images, though.

Chuck Peacock

http://www.freestylephoto.biz/sc_prod.php?cat_id=&pid=1000003211
http://www.freestylephoto.biz/pdf/msds/moersch/Moersch_MT12_Cobalt_Toner.pdf

[CG]

Somewhere in the UK I have a Cobalt toner formula, I have also used a Cadmium toner for white tones.

Ian

Any chance you could share the Cobalt and Cadmium toner formulas?

Thanks!

C