If you’re looking for brand name results when mixing your DIY Homemade Chalk Paint, this is the product to use. I’ve been using this brand exclusively for the last 3 years. This is a human grade supplement and this calcium carbonate is so super fine, it doesn’t even require mixing with water before adding it into your paint. There are slightly less expensive versions of calcium carbonate that can be purchased in bulk, but I get the best results with this. This NOW brand is easy to use and gives me professional results when mixing custom chalk paint.