Using an i1 pro you could measure the colour of the light and by printing a range of colours select the one that gives the correct light. Printing is generally a cmyk process and gets intermediate colours by printing different coloured dots so your not going to get a pure spectrum as you would with a specific dye Edwin -----Original Message----- From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of mark@xxxxxxxxxxxxxxxxxxxx Sent: Tuesday, July 14, 2009 4:43 PM To: List for Photo/Imaging Educators - Professionals - Students Subject: DIY flash gels I saw a blip on the web about a method of making your own flash gels. They had a file with all 27 colors of flash gels you could take to someplace like Kinkos, print them out on acetate and wha la you have a flash gel. They would provide the file of the 27 colors if you signed up for their free website (I didn't) and an entire set of gels would have been about $15 or so. Just curious if any one more knowledgeable could provide some insight on whether or not this method would work and how to come up with the correct colors (that is without going back signing up and downloading the file) and some other way might work better. This kind of thing always intrigues me. I guess it is the natural tickerer in me. Mark