135 vs 120 Developing Question

[Gerald C Koch]

The stock used for 135 and 120 is different. The stock used for 135 is on a tinted base which would make it appear the negative were more dense. 120 base is untinted.

 

[Rudeofus]

The contrast seems to be similar, as I'm printing about the same VC grades on either 135 or 120 negs. It seems to be a density change.

Is this fog, or just a differently colored film base? If you dip a small piece of 35mm HP5+ directly into fixer, this will tell you the base color of this film. Any extra density outside the exposed areas of your developed specimen would be fog.

 

[Sirius Glass]

135 and 120 film of the same emulsion have different development times. When possible stick with the film manufacture's information.

The film bases are also different thicknesses.

You can measure the density all you want but what I said still applies.