Ok for some reason when I try to paint over something, there is a "blotch" of colour left behind.
See this example here-
Just a blackish square right...
...well if I wanted to paint over that, with say the colour from the background, it leaves behind a trace of the old colour-
It stays there no matter how many times. Ive been using the Round camalhair,
chunky oil pastel, Chalks as some of my brushes.
Is it just part of how some of the brushes behave?
Really frustrating me at the moment