Eye protection and a fine-particulate mask are recommended when working with enamels. Keep food and drink away from your workspace. Keep all your leftover / spilled enamel powder and use it as a counter enamel for locations where the color is unimportant. (We normally place a piece of paper on our sifting worksurface, so we can easily dump excess enamel back in the container it came from, or in a mixed bin.)