The Painting Mum blog has a new article discussing wet palettes.
From their announcement:
So you have problems with your paints drying too fast and don’t like to use retarders?
Ana posted another answer to a question asked by a follower of her blog. He wanted to know how she makes her wet palettes, a very useful tool for every miniature painter, allowing to prevent paints from drying too quickly on your palette.
She also explains if she adds any chemicals to her water when painting miniatures.