Bleaching formula for toning

ericdan · May 30, 2018

What type of bleach is required for sepia and or selenium toning?
Does any of the reducer formulas on the massive dev chart work for this?

awty · May 30, 2018

Potassium Ferricyanide & Potassium Bromide is one.
Selenium doesnt need bleaching
Sepia can give different results depending on paper and bleach concentrate.
If I split tone some papers I need to selenium first and some sepia first. Warm tone paper are especially fast to bleach and tone in sepia, so I will usually use a weak bleach and selenium first.
Really need to experiment, no papers will react the same.

ericdan · May 30, 2018

thanks a lot Paul.
what ratio of Potassium Ferricyanide & Potassium Bromide do you use?

awty · May 30, 2018

I bought a packet of Kodak sepia kit, before I realized I already have the chemistry.
Think the standard is 10%Ferricyanide and 5-10% Bromide, but it might be best to start with 1% depending on the paper and whether you are split toning or not. Some warm tone paper will bleach out in seconds and other types of papers will take minutes.

Herzeleid · May 30, 2018

Here is detailed formula of a sepia toner. I have used it many times.
http://home.alphalink.com.au/~simgrant/jackspcs/tpt.htm

awty · May 30, 2018

Herzeleid said:
Here is detailed formula of a sepia toner. I have used it many times.
http://home.alphalink.com.au/~simgrant/jackspcs/tpt.htm

Thanks. Will be mixing mine from scratch from now on.

Ian Grant · May 30, 2018

For warmer tone you can use Sodium Chloride instead of Potassium Bromide. Same proportions.

Ian

esearing · May 30, 2018

My stock bleach for Thiourea toner is 50g Pot. Ferri, 10g Pot. Bromide, 30g Sodium Carbonate monhydrate, to 1 Liter of water. It works fast for full bleaching. Dilute 1-5 or 1-10 for slower action.
10g of PotFerri in a liter of water is also a good basic bleach and can be mixed with a little rapid fixer to form a local bleach (farmers reducer) for finishing a print.
You can also find formulas for Copper sulfate and PotBromide which works very quickly - or add Dicromate and it becomes a bleach for Bromoil. It can be used diluted for Toning as well but it tans the emulsion.

pentaxuser · May 30, 2018

Herzeleid said:
Here is detailed formula of a sepia toner. I have used it many times.
http://home.alphalink.com.au/~simgrant/jackspcs/tpt.htm

Under Stock Solution B Hydroxide for Toning is there a typo?It says cold water to make 100ml in line 2 then cold water to make 100ml in line 3 Should this be to make 1000ml and not 100ml as stated?

Thanks

pentaxuser

Herzeleid · May 30, 2018

pentaxuser said:
Under Stock Solution B Hydroxide for Toning is there a typo?It says cold water to make 100ml in line 2 then cold water to make 100ml in line 3 Should this be to make 1000ml and not 100ml as stated?

Thanks

pentaxuser

Definitely a typo. Final volume should be 100 ml.

Identical formula shared long ago by Ian Grant
https://www.photrio.com/forum/threads/simple-bleach-sepia-formula-ques.30802/#post-433495

darkroommike · May 31, 2018

MOST selenium toners are one bath but the Dassonville Flemish Toner is a bleach and tone process using selenium.

Bleaching formula for toning

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