Cyanotype Exposure Time Calculator

Use the tool below to see approximate times for exposing cyanotypes in UK sunlight.

Please note that these calculations are based on the conditions below:

Exposure time: Noon (if you expose much earlier or later in the day exposure time will be slightly longer).
Location: Central UK, exposure outside, clear view of sky without obstruction.
Glass: No (Some glass will filter UV light and may need a longer exposure).
Coating: Classic Formula on paper (dried overnight).

These times are only a guide to help exposing with the sun, you may need to adjust exposure times to suit your setup.

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