Ilford MGIV

Ian Grant said:

Tom, adding extra carbonate can help reduce warmth, too much though gives base fog, but more Benzotriazole + Carbonate may well help.

Usually Blue tone developers (MQ) have less than 1 gm KBr.

Ian

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How about 25g Sodium Sulphite, 100g Sodium Carbonate, 0.5g Benzotriazole? I presume a higher concentration of Metol helps the cold tonality to come through? e.g. 4g Metol, 12g Hydroquinone

Is Potassium Bromide always recommended?

Tom

KBr is in all commercial published formulae but it can be omitted, usually it's as low as 0.5g/litre of stock developer.

I have some other anti-foggant which may give colder tones than Benzotriazole, I need to find the price list from Hogg Labs where I acquired it as that says what it is (it's just marked Anti Fog 2 or similar).

We can liase/meet up when I'm next in the UK to experiment

IAn

Ian Grant said:

...I have some other anti-foggant which may give colder tones than Benzotriazole, I need to find the price list from Hogg Labs where I acquired it as that says what it is (it's just marked Anti Fog 2 or similar)...

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If it's the same as Kodak Anti-fog 2, then it's 6-Nitrobenzimidazole Nitrate. It's mentioned in Kodak tech pub J1, where Anti-fog 1 is Benzotriazole. But while it's mentioned that benzotriazole is used for both films and papers, AF2 seems to be used only in film developers.

Tech pub J1 (20MB pdf)

I'm fairly sure it is but I need to double check, the same suppliers other antifoggant was IBT Ilford's Benzotriazole/Carbonate formula.

Ian