Preparing cyanotype sensitized materials

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Ordinary  household light bulbs are tungsten filament lamps with a color temperature around 2000-3000 oK.

Although some literature out there still talks about bug lights and safe lights, coating under these kinds of lights is not only unnecessary but can be detrimental since the sensitizer is yellow-green and hard to see under a yellow light. Use a 15 -25 watt incandescent light bulb.

The coated paper is not sensitive anyway until it is dry. BTW, do not dry with a hair dryer. Let it air dry naturally or use a small fan. Application of heat will result in a loss of contrast.

Flourescent lights and halogen lights produce UV light and shound not be used when coating. There is a halogen bulb on the market shaped like an ordinary light bulb so watch out for it.

Bob Schramm
Check out my web page at:

http://www.SchrammStudio.com also look at: http://www.wlsc.wvnet.edu/www/pubrel/photo.html

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