135 vs 120 Developing Question

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.

KidA said:

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.

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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 said:

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.

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