The paint is paint- as long as you have it thick enough to be opaque, it looks the same if you apply extra anywhere. This was also necessary because it was layered over a background. Anything not opaque would be partially transparent when laid over the background. So it had to be opaque
Keeping the paint look *identical* was a big thing.
The backgrounds were often watercolor. It was not possible to anything other than scroll it around, it must be static. Because you can’t repaint animation cells in watercolor with any consistency.
Thus the Scooby Doo “secret door” or “something hiding behind a bush” being so obvious. If it opened or the bush shakes, that’s animation so it has to be painted cells laid on a static watercolor background.
Speed and skill. Each pencil drawing by an animator was traced in ink on to a transparent sheet. Once the ink dried it was sent to painting where the paint was applied to the BACK of the transparent film. Each section of color had to be completed quickly while the paint was still very wet so it would show no brushstrokes or the cel was ruined, but going outside the lines would also ruin a cel, as even though it would not obscure the line, it would still show the color in the next section over.
In the golden age of Disney the ink and paint department was a fleet women who’s only job was to trace or paint. The inking girls were considered to be a higher caliber than the painting girls, as their work required a more steady hand, but the painting girls were amazing in their own right. One of the greatest accomplishments of that department was maintaining consistency in color and positioning on Snow White’s blushed cheeks, which were done with *actual blush.* The effect was so time consuming it was never used again. They stuck to solid colors from then on out.
Edit: I have been corrected below. The use of actual blush is an urban legend. The effect was achieved no less amazingly with a dye applied to each cel by a very talented woman from inking named Helen Ogger. See the post correcting me below for more detail.
Cel vinyl paint. It was all premixed and put into tubes, ready to be used by the colorists. so there was no need to mix colors when it was time to paint. that’s where you would run into inconsistencies with paint color.
There were no brush strokes in the color because for one, it was painted on the back of the cels so the camera, and you the viewer was really just seeing the underside of painting behind some thin plastic. Also cel vinyl had a thick, almost glue-like consistency so it flattened out quickly and evenly when painting. Artists didn’t need the built up layers that oils or even acrylic needs to get rich, even color.
I painted a lot of artwork with cel vinyl, just because of those qualities. It was the best! Sadly the only company that produced cel vinyl paint, Cartoon Colour Company just quietly went out of business a couple years ago.
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