A UV Light for Cyanotypes
The traditional cyanotype process, now regarded as alternative processing, requires a UV source for curing (exposing) the prints. This post outlines the requirements for such a UV light source and some options to consider, along with the associated pros and cons, and then to look at one specific light source in more detail. Everbeam UV Flood light What is UV light Ultraviolet light, known simply as UV, is electromagnetic radiation of wavelengths 10–400 nanometres, shorter than that of visible light, but longer than X-rays. UV is typically broken up into 3 bands: UVA - 400 to 320 nm UVB - 320 to 290 nm UVC - 290 to 200 nm UVA is the range for cyanotypes with 365nm usually considered a good mid-band wavelength that is effective for exposures (think of the numbers of days in the year and then the wavelength is easy to remember). Can I just use sunlight If you don't have a UV light source then sunlight is an option. The atmosphere blocks UVC and some UVB so the UV light from the sun...