Preparation Instructions: To make a half gallon of size: Add 1 level tablespoon + 1 level teaspoon of carrageenan into a blender. Fill it up to the top with cold water. Blend it on the highest speed for 1 minute. Pour the foamy mixture into a 1/2 gallon container (i.e. empty plastic milk jug) & fill it to the top with water. Shake it. Let stand overnight in the refrigerator to let the foam bubbles pop. The size will last ~ 10 days in the refrigerator When it begins to lose its thickness and becomes watery it is no longer good for marbling. Ordinary tap water is usually fine for making the size. If you have hard water, or heavily mineralized tap water you may want to substitute distilled water. You can print 20 - 25 sheets on a tray of size.