For Cyanotypes
Use a dose of 60 as a starting point.
Expose a small test piece of artwork using the Altxpo app.
When the exposure is complete move your phone to a safe place and wash the print as normal.
If you need a darker print or more detail add 10 or 20 to the dose. If you need a lighter print or less detail subtract 10 or 20 from the dose. Repeat the test if needed.
When the sun is weaker during sunrise and sunset the light quality drops and a bigger dose will be needed to achieve fine detail prints like petals and transparencies.