Tri-Color Gum Bichromate – Round 2

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Our first Tri-Color Gum Bichromate workshop with Diana Bloomfield last September was such a hit, we decided to do it all again! This past Saturday and Sunday Diana led nine students through this labor-intensive and difficult process. The workshop included many first-time gum printers, and despite the tricky nature of the process, all produced fantastic prints! As we gathered around to look at everyone’s completed work at the end of the two days, one thing was apparent: there is nothing like the magic of gum printing, and no one better to teach it than Diana Bloomfield!

We are grateful for all of our students, but we especially would like to extend a big THANK YOU to our four class participants who travelled from far, far away to take this workshop with us – Cary from Alaska, Timothy from Michigan, and Scott and Kelly from Pennsylvania. We’re so glad you could join us!

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Diana discusses digital negatives during her demonstration at the beginning of the workshop

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Diana “develops” an exposed print in water

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Diana discusses the cyan-layer exposure she demonstrated as it hangs to dry – Terry, the student who provided the negative for this print, will later add yellow and magenta layers

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Janet washes out her print after exposing the yellow layer

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Karen coats her paper with a mixture of watercolor pigment suspended in potassium dichromate and gum arabic. The potassium dichromate hardens the gum arabic upon exposure to UV light; the parts of the coating blocked by the negative remain soft and wash away in water.

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Tim washes out his print

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Kelly very carefully registers the negative for her next layer

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Janet, Tom, and Matthew attend to their prints

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Each layer of pigment make a big impact when gum printing. The print on the left includes cyan, yellow, and magenta layers; the print on the right includes cyan and yellow. Both prints by Karen Hymer

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Diana discusses the finished prints one by one with the class

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Karen, Diana, and Tom mask off the brush-marked border of Cary King’s image in order to look at the print without visual distractions

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Scott Wrage shares his tri-color print, not yet dry enough to pin up, with the rest of the class

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Prints clockwise from left by Matthew Covarrubius, Kelly Wrage, Karen Hymer, and Timothy Wells