Malte279 In reply to TheTyrannosaurus [2020-02-21 09:29:33 +0000 UTC]
I use colors specifically made to paint porcellain and glass to create these. The colors are applied then need to dry for a couple of hours and then the porcellain or glass are put into an oven to fix the colors permanently. With most of the projects I make the colors are applied in several layers (often I do the outlines and the filling seperately).
The colors come either in the form of pens or as liquid colors to be applied with a brush. Both versions have advantages and disadvantages. With the pen colors (which I used for the cup above) it is very tricky to get a truly smooth surface. You can still see the strokes of the pens which can be a nice effect in manes and tails but not so much with parts which you want to look very smooth. The pens also allow to easily apply the colors in different thickness (and therefore shades) by either applying strokes (thin color) or dabbing (thick color).
With the liquid colors applied with a brush you have the advantage that they can be mixed to create every color you need (while the color range of the pens is limited). However a major irk with those colors is that they tend to accumulate in the middle of a painted surface while thining out towards the edges so a smooth color surface is very tricky to make with them in spite of them not having the pens' stroke pattern.
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