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@other Matthew :-) thanks for the tip, will look for it next time im in the hobby store
Dave, sure, any art shop where they sell W&N oils they'll probably sell the Liquin.
Now I'm at home I looked in the book - note what is said about using quite a big brush (damp, as Frank notes) and to mix them slowly keeping going in the same direction. One thing not mentioned is that the paint dries of course, and by blending at different points in the drying stage, slightly different effects will be achieved. If thinned with spirit, and you just keep wiping the damp brush over you will remove almost all of the paint; if you leave a little longer then the paint will start to thicken, so blending can be done progressively harder or softer. The Liquin added to the paint can be used in the same way. Knowing when the paint is thickening and setting is something that only you will know, depending on many factors, like how warm the room is, how thin the paint is, etc. Sometimes you can apply oil paint, spread it and blend it, then leave it for 5 minutes, 10 minutes, or 30 minutes, and then go back and spread and blend it again. This is all characteristic of oil paint, and remember, if it all goes wrong, you can probably remove it with spirit without damaging the basecoat and start your oil effects again.
You could I suppose possibly try toning down the blue colour by overlaying another filter of a different colour?