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Bob Ross has his own line of oil paints. His paint is a thicker consistency than standard oil paint. He also uses Liquid White, Liquid Clear, and Liquid Black before he starts to paint. These are quite runny. You can make your own using a good bit of linseed oil mixed with a tube of black or a tube of white oil paint. Liquid clear can be substituted with plain linseed oil.
Liquid acrylics, sometimes mixed with gouache. Read all about it on http://www.robertbateman.ca/art/rbop/rbatemanonpainting.html
The ancients made a very good blue dye from the plant woad. To achieve the dye, the aerial parts (above ground: leaves, flowers and stems) of the plant were finely chopped and packed tightly into a wide mouthed container. Boiling water was added until the plant material was completely covered and the container was set aside for about an hour. Then the infusion (liquid) was strained off. At this point lye was added and the mixture was beaten with a whisk or similar implement for about fifteen minutes or so and the mixture would have been set aside to settle. Every day or so, any of the clear or very pale liquid that rose to the surface was poured off, until the remaining liquid was very thick and very dark. This concentrated liquid was poured into a wide pan and slowly evaporated off. The resulting dye was a dark blue powder that was usually mixed with animal fat to make a blue body paint. Please NOTE This process was messy and the dye was permanent, so those making the dye carried the stains for quite a while.