Mixed colour components diffuse differently
Knowing that aquarel paint behaves sometimes unpredictable, I came across something strange during my beginners experiments.
I was adding some grey accents in a skypaint, made of ultramarine blue and light red. As the painting dried I noticed that the ultramarine component had stayed on the original location, but that the light red component had shifted upwards (see area A and B).
On another location, C, it was not.
It doens't look natural, so am asking advice on how this can be prevented?
Details materials: paint from Winsor&Newton, paper: Baohong, 100% cotton rough texture, wetted on both sides. Painting was flat on the table (maybe the table is very sligthly tilted backwards)
Thanks for any reply
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I have done some new 'research' and came up with an answer and new questions ...
I used ultramarine blue- extra fine- from Schminke's Horadam serie and came up with some totally different : the colours both diffuse but don't seem to separate.
So far I'm happy with the result, so I thought : it has to be (some sort of) extra-fine grade paint to avoid this shifting, which is mainly due to granulation, if I'm correct.
Went to my supplier's website and checked for some specs of the paint.
To my surprise they call almost everything extra-fine. Also the Winsor&Newton which I used to start with. They even have 'super granulating - extra fine' paint. Now I'm lost again ....
Is there any logic (specs, characteristics, consistency in terminolgy) I can rely on?