Originally Posted by alhajri
I have a paint making set. Medium muller and square glass. I use Cold pressed Linseed Oil and the Sennelier dry pigments. I've made Ivory Black so far. I like the experience. It's fun and educational. But as gunzorro said, brand name will be much better in quality because hand grinding the paint will take time and will not be as precise as the machine.
I would still do it for fun. But the quality control isn't that great. I would find some lumps of ungrounded pigment.
One simple point, about the practical process - process through as a series of small lots under the muller:
When you mix the oil and pigment powder initially, it should form a rather dry paste. Mix it together with a palette knife by folding it over. It's OK if its a bit "crumbly" - you don't want it "oozy" at that stage. scrape it into a pile at one corner of your slab.
Now - take a small amount of that
- put it down centrally on the slab, put the muller down on top of it, and briefly mull it. You should find that it goes from paste to fluid. Scrape it up off the slab and from the bottom and round the edge of the muller, and put it to one side. Do the same with another small amount, mulling it and adding in to the "processed" pile. Work your way through in small batches like this, until you've done one pass on the entire pile of starting paste.
If the "first pass" paint is very fluid, you can add a little more pigment, and mull it again quickly in small batches, accumulating a "second pass" pile.
It can also be advantageous to let the paint stand overnight (cover it with a couple of sheets of clingfilm/saranwrap) and then remull it again. Use the consistency of the paint be a guide as to whether you need to add more pigment (you're less likely to need to add more oil - what starts out as a very crumbly paste can liquify surprisingly, under the muller).
After mulling 2-3 passes, I add about 1-2% of a thick paste of beeswax in turpentine, mix this in well and briefly mull again.
I suspect some people may get into a mess, or produce poor-quality results, because they are trying to process too much volume of material under the muller at one time? My experience is that its quite hard work, and time-consuming, but that you don't need to be mulling the entire tube-full of paint for hours - instead, each little lot is only mulled on each pass for a minute or two. Cumulatively, the whole process takes a long time if you're making enough paint to tube-up.
I've got paint, tubed up, that I prepared in this way, thats as good as the day it was made, after storage times of a couple of years or more.