Using formalin instead of paraformaldehyde

[Lyn Arnold]

Hello all...I wish to mix up the lith developer Dupont LD-1 (UnblinkingEye site). The formula calls for 7.5g of paraformaldehyde per litre of developer. How much formalin at 37% solution should I use as a replacement? I've tried to find the answer here and through Google with no luck.
Thanks in advance, Lyn.

 

[alanrockwood]

Here is a link that might contain the information you need, though it might require you to do some calculations.

http://stainsfile.info/StainsFile/prepare/fix/formalin/terminology.htm

 

[Lyn Arnold]

reply to chemistry question

Here is a link that might contain the information you need, though it might require you to do some calculations.

http://stainsfile.info/StainsFile/prepare/fix/formalin/terminology.htm

Thanks alanrockwood. Not many chemists out there???

Lyn Arnold

 

[donbga]

Thanks alanrockwood. Not many chemists out there???

Lyn Arnold

I'm working my vague memory here but I don;t think the two are interchangable, but I could be wrong about that.

 

[Photo Engineer]

Paraformaldeyhde turns into formaldehyde in water. I believe it needs a drop of base to help it along. I don't remember. I would have to look it up.

PE