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Alternative Photographic Processes - (Hand made photographic -emulsions and processes)

Exposure tests

While you can carry out a series of exposure tests using the contact negative for the image, it can be more informative using a tonal step wedge where the tones are precise and known.

Creating a step wedge in Photoshop



You can either conduct these tests with the step wedge or include it along side the image. Here we see the negative lower, a test on .. centre and a teston Hahhamule paper


When it comes to establishing an exposure you will find there ae a number of variables that come into play.

For instance:

The light source

Length of time for the exposure

Paper type

Cyanotype test on Arches Water colour paper at top - Hahnaule paper at bottom

Number of emulsion coatings



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