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Title : Fade Test for Gouache
link : Fade Test for Gouache

Fade Test for Gouache

A little more than nine months ago, the Shinhan company of Korea sent me a set of their Pass Design watercolor/gouache hybrid paints to try out. 

I gave a preliminary review of the brand's working properties after a painting a pharmacy using a limited palette of colors. 

I also painted a set of test swatches. The top half of each swatch is pure paint from the tube. The bottom half is tinted with some titanium white. 

I then cut each set of swatches in half. The left half of the swatches went into an envelope in the basement, where they remained dark and cool for more than ten months. 

I put the other half of the strips into a south-facing window, where they received full sunlight. I re-united the two halves, with the exposed half on the right. If there's a color change from the left side of the swatches to the right, it's because of the difference in exposure.

The overall impression is how stable and lightfast most of the colors are, such as 880 (Raw Umber) and 885 (Burnt Sienna) below. With those lightfast colors, you would be safe framing and displaying your gouache painting even near a sunny window inside your house.

Pigment, lightfastness, chemical descr., and pigment (CI) identification

808 Bright Red ** Rhodamine 6G, Monoazo, BR1, PR48:1

810 Vermilion Hue * Rhodamine 6G, Monoazo, PO16, PR48:3

811 Orange ** Diazopyrazolone Arylide Yellow G, PO13, PY1

861 Red Violet * Zanthine Rhodamine 6G Lake, PR81, BV11

868 Shell Pink ** Diazopyrazolone Naphthol AS, Titanium Dioxide, PR 48:3, PO16, PW6

865 Opera * Tetrachlorozincate, Rhodamine 6G Lake, BV11:1, BR1

880 Raw Umber *** Synthetic Iron Oxide, PR101

882 Light Red *** Synthetic Iron Oxide, Disazo Pyrazolone, PR101, PR60:1

885 Burnt Sienna *** Synthetic Iron Oxide, PR 101

However, there are some colors, particularly those in the pink and red range, that suffered significantly from light exposure. I was surprised that the fading was worse in the bottom half, where the pigments were tinted with white. Even some famously stable pigments, such as Light Red (882 above), faded when tinted with white. 

Fortunately, the manufacturer gives detailed information about every pigment, and the pigments that suffered the worst light damage for the most part had low lightfastness ratings ( one star * in a range up to ****).

There are only 8 one-star rated pigments in the set of 48 colors. Those fugitive pigments would be better used in design applications or sketchbooks where they won't be exposed to light. 

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On Amazon: Shinhan Pass Design watercolor/gouache hybrid

Lightfastness tests of watercolors by Bruce MacEvoy

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