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You can mix it and keep it in a bottle.
It will begin the drying process when exposed to oxygen / open air, starting with the turpentine to evaporate and next the oil will obtain oxygen.
The oil is actually getting thicker when it obtains the oxygen, which is why one should be careful to not apply too thick layers of ordinary linseed oil. The danger is that it will wrinkle.
Paint can be applied thickly straight from the tube, but be careful not to make it thick, fat paint by adding undiluted linseed oil.
Stand oil is treated in a way that makes it more stable, it will not wrinkle, even if it is applied heavily, which makes it suitable for glazing as well as for ordinary medium.
Allan
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