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Mark Wheatley's avatar

Colleen, you absolutely know your stuff about dyes. But you are confusing one point. And many working pros, over the years, also make this mistake. "Non-repro blue" is not really invisible to a camera. For line art reproduction, light blue takes a longer exposure to show up on a negative. So it is fairly easy to drop it out of line art shots. But, if you wanted to capture a page of blue penciled art, you could shoot a halftone and capture all the subtle details. Give it a long enough exposure and you could get a line shot out of it. The negative would be very dusty, but it could be done. In the case of blueline color paintings, the camera sees that blue just fine. The same way it sees the same blue used in the painting. That blueline ends up backing up the black line art when printed, making the black line richer and darker. This is important, since the black ink commonly used in CMYK printing is transparent. Printed without other colors, that black ink appears washed out and faded. My studios, Insight Studios, provided bluelines for all the major and many of the minor publishers up until about 2006, by way of credentials.

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Dan Collins's avatar

Hi Colleen, I used Dr M’s in the seventies and up until I went digital in 2004. I’d done hundreds of colors and they have all kept their brilliance. Only a small number have ever hung on walls for long but they aren’t too worse for the wear unlike those you posted. The rest have been kept out of the light and are in pretty much mint shape. Some are a little discolored in the paper substrate I used for a time, Strathmore Illustration board, with a yellowing. Have you heard of Nicholson’s Peerless Transparent Watercolors? I just found and old box set I got but didn’t use much. Still in good shape. I checked my old Dr’s and more than a few have dried out in the bottles but most are still good. It’s not like I’m going to start using them again even though I have a half full package of Strathmore Bristol cold press two ply. I can pass it all on to my artist grandson Escher. New subscriber here.

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