Growing up in a house full of painters (with natural home made paints) I knew how to mix all my colors from primaries before I was 4 years old...
thomas rubino wrote:First, is this all old news to "cob people" ? Is using dyes and pigments common practice?
Some of us...it is very old news......and yes is common practice for many of us...
thomas rubino wrote: If so is there any heat restrictions with using pigments ?
Almost all the mineral base pigments are "heat resistant." The challenge is the binders, and carrying agents...these aren't in most cases. Just water and pigment can do a great deal but needs to be reaplied as it "dusts." Many will also "variegate" depending on degrees of heat.
thomas rubino wrote: What about using shellac either mixed with or painted over dry pigments ?
Thousands of methods for this...not on hot surfaces, they burn off...
thomas rubino wrote:Can the shellac work with outer barrel temps around 200 F ?
No, or not over any significant time period without going through different degrees of oxidation, and change (variegating.) Glazes are the only methods that have the best resistance and these can 'crackle' or chip.
thomas rubino wrote:Is there other products that might work better ? What about linseed oil ?
Flax oil will burn off leaving the pigment behind that dusts, but some of these methods are very interesting...Experimenting is fun. I know of no heat resistant commercial paint that is not highly toxic as are the manufactures.
I'm sure that I'm not the first person to stumble across this, although at the rmh forum i've never heard any word of doing this. Is there more information or guidance that I need before proceeding ?
Here are some more (of many) links in no order of importance that you may enjoy having:
Real Milk Paint
Olivetti Organic Finishes
Paints, Stains and Pigments are a world onto themselves...The more you learn the more you will be intrigued by this craft and art form...As well as, demystified by all the hype "paint manufactures" claim about modern paints.
Today still the oldest (5000 plus years) paint (and most durable) has been a tempera paint form in Egypt.
Glad you are enjoy playing with color...