Q: Hi. Why is marble dust noted as a carcinogen (in California), while whiting is not? Is it because of the smaller micron size? Also, why the extra shipping on both this product and on whiting chalk? Thanks.
A: California lists the Marble Dust as a toxic substance, because it contains trace amounts of silica. The chalk may also get that rating soon. The ratings change every year.
Both the Marble Dust and Chalk are very heavy materials and shipping becomes expensive. The listed prices are actually discounted.
Q: Is your marble dust product only contain marble dust?
I am looking for such to be used in the finest lime finish plaster, tadelakt.
I also need the next two grades of courser aggregate. Do you carry those as well?
A: Yes, our marble dust only contains crushed marble and is often used in all kinds of plaster finishes. We do not carry any other grades of marble dust.
Q: I am looking for marble dust to use in plaster casting. Would you recommend the fine or more coarse dust to make a harder molded object? I plan to use it in a ratio of 40% marble dust with the plaster.
A: We would recommend the Fine Marble Dust, unless you want a rough texture on your plaster cast. 40% ratio may be a little high. We would recommend more of a 10-20% ratio.
Q: Can I use this product as a filler for chipped arificail 'marble' on a vanity top? i woild paint it using gum arabic gouache paint. Thanks
A: Yes, you can use the Marble Dust as an infilling for a marble counter top. You would need to bind the marble dust with a binder, such as an acrylic. The Gouache paint will not dry to a waterproof paint and can easily be redissolved with water.
Having read your introduction, I’m still unclear if marble dust is a *type* of calcium carbonate, or if it *is* calcium carbonate!
What so the difference please?
A: Yes, it "IS" pure calcium carbonate with a trace amount of silica.