Making Watercolors with Pigment Dispersions (Quinacridone Gold) скачать в хорошем качестве

Making Watercolors with Pigment Dispersions (Quinacridone Gold)

In this video, Noelle shares her techniques for making watercolor paints out of both dry pigment and pigment dispersions. She demonstrates how to hydrate gum arabic powder and the base recipe she uses to showcase the dispersion’s best characteristics. She uses Quinacridone gold, a very sought after extinct pigment. She discusses the behavior of different chromophores (color families), mentioning both pigments that are easier to make into watercolors, and also those that are more challenging. There is not one standard watercolor recipe for all pigment dispersions, as each pigment has different physical properties and will need different adjustments. I will detail these factors further down in this description. You may be able to use a premixed water color medium that you have, but our experience is with our dry gum arabic (rehydrated 50/50 with water overnight in the fridge, store in fridge while liquid, make no more than you can use within a month or two), dextrin, and glycerine. As seen at 2:50 in this video, our baseline recipe for watercolors uses a ratio of 4 parts rehydrated gum arabic 2 parts pigment dispersion 1 part dextrin (we have used cornstarch and tapioca starch) 1 part glycerin (we use vegetable glycerin from the drugstore) You should first mix the pigment dispersion with the dextrin, then thoroughly mix in the glycerin, and then finally add the gum arabic. The watercolor should be dried out in pans to prevent mold, or stored in the fridge to prevent mold. You may be able to prolong the life of the watercolor while liquid by adding sodium benzoate or clove oil, but it may affect the sheen and drying time of your watercolor. Before drying your watercolor out in pans, do a test swatch to see if you should fine tune your watercolor. A few considerations are: 1) Tint Strength Some low tint strength pigments need to be added in a much higher concentration to reach full saturation (like ultramarine, which benefits from 3:2) while other high tint strength pigments are overpowered in watercolor, like the pthalos. Look for bronzing in your test swatches as a sign that you need to increase gum arabic. A rub-test with a clean paper towel is also helpful to check that your pigment is fully bound. We show the tint strength for every dispersion in this pdf color chart. 2) Chromophore Some chromophores (color families) like the quinacridones are too grippy to stay evenly dispersed in a weak binder like gum arabic. Adding dextrin and glycerin directly to the pigment concentrate before adding the gum arabic gives them something to hold on to so that they don't reattach to each other (flocculation). Flocculation will make the swatch look speckly and under saturated- if you see this in your test swatch, try making the mixture again with way more dextrin and use more gum arabic in your mixture. Please call us at 212-529-0628 if you still have any questions- we are available to answer your technical questions Monday-Friday, 12-7pm ET.