Have just obtained two new watercolour mediems,
Aquarell glass and fix. On each jar it says "Do not mix colour + medium in the pan". What exactly does this mean? Where and how do you mix the medium with the colour? Can you not use the palette?

We are sorry but as we do not stock Aquarell mediums other than Aquarelle paper, we are not qualified to answer this question. We do not have a suppliers address to give you because the paper would come through a different supplier.