Hello,
I grind my own paints using the CPVC and a medium thats 50% linseed oil and a 50% polymerized linseed oil that doesnt have a low ph.
My issue is that I glaze and i want to properly dilute my paint. Some people tell me to dilute simply with oil, others with a 50% stand and 50% spike oil mixture and im sure there are many other ways.
Is there a proper way that one can dilute the oil for glazing? Is there a math formula, like the CPVC formula ,in order to find out how much solvent can be used before it becomes unhealthy for the paint? I ask this bc if there is i can use spike oil on it own in a safe way.
Thanks,
Hector
First, I am no fan of spike oil. Its claims of lack of toxicity result mainly from the fact that it has never been rigorously tested. It is also very slow evaporating and is relatively polar and aromatic. It can dissolve or at lest compromise lower oil layers. It is probably totally fine for ala prima painting, especially on oil grounds, but that is not what you are asking about. Others may disagree with my assessment but as I wrote, it has really never been tested.
Your 50/50 sounds pretty fat to me, but, of course, that depends on how much you are adding. Small additions are probably fine. There are no established mathematical formulae, because in oil painting, each pigment is so different in terms of required oil. However, using proper PVC means that you are really able to simply slightly thin the paint and it should be fine. A little more oil will help to create the rich glaze you are looking for without going overboard.
I suggest erring on less oil and not more.
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