Used this for chalk festivals and got the vibrant colors I wanted. I bought two boxes so I can have 12 of each color. I ran out of skin tones in my 10' by 10' piece. But I think it's because it was done on the sidewalk. If it's cement, you should have enough for 7ft by 7ft. I haven't had a chance to mix it with water and paint with it yet, but I'm sure it would be great. One of the boxes I ordered came out pretty good, but the other had broken chalk. This makes it difficult to create large works for festivals.
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