Bleaching formula for toning

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ericdan

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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

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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.
 

awty

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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.
 

esearing

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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.
 

Herzeleid

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darkroommike

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