We often get asked the question “How long will it take to expose my cyanotypes in the sun?” and the answer to this is always “It depends.”
With winter drawing is and with not much sunlight we want to give some pointers on how long it will take to expose your cyanotypes in the winter.
If the weather permits and it’s not raining exposing your prints outside is always preferable. The best time for exposing is around noon, this is when the UV is the strongest. Put your paper pointing towards the brightest part of the sky. Exposure times will vary depending on time of day and weather conditions (see below).
If it’s raining you can expose inside. If you do this you can put your paper in a window but expect longer exposure times. You may need to test to see if your window glass blocks UV.