Can I make cyanotype prints on overcast days?

Yes you can! The same way it is possible to get to get sunburn at the beach the beach on an overcast day, it is also possible to make Cyanotype prints on cloudy days. The time it will need to fully develop will be longer, depending on just how overcast it is, prints might have to be left for up to an hour to fully develop. Should you have access to a UV light, this can also be used as a controlled UV source for printing. The duration of exposure time will depend on the specifications of the light used. Make use of test paper and make notes on the back to compare and determine the ideal exposure time.