Go to the kitchen and get a little powdered saffron, powdered red food or cocoa and add a little oil (sunflower, poppy, walnut, safflower, it dosen't really matter which) and mix it up with a knife or spoon. You have now produced a genuine oil paint ( and unlike many others, one you could eat it without harm). Find some zinc cream (used as a sunscreen) in the bathroom cabinet and now you have a white oil paint - now some black boot polish and you have a decent black oil paint.
If it is a little thick or hard to mix you may add a little turpentine, thinners or petrol which will obviously cause it to mix easier and dry faster.
Note: it is usually the chemical pigment or the thinners that causes the extremely poisonous nature of most commercial oil paints (lead, cadmium and arsenic are old culprits). If the powder you use is unusually strong you might be tempted to add a filler to bolster up the mixture. This could be chalk or ground marble or some other neutral powder. Student oil paints usually have more filler than Artists' brands. Filler is cheaper than pigment so you get what you pay for!
OK, so now what do we do with our mixture? If we had two lumps of 'mixture' (paint) say a red and a yellow and made them very oily and put them side by side on a flat surface they would gradually spread out and merge and take ages to get dry. So more oil will help paint to blend and merge as oil is also the lubricant for the pigment and helps it slide around on the canvas.
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