Ilford MGIV

[Tom Kershaw]

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

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

 

[Ian Grant]

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

 

[Anon Ymous]

...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)...

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)

 

[Ian Grant]

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