This kit wasn't what I had hoped it would be. Maybe we got a bad batch of materials, but the litmus paper and the rock candy experiment didn't work. But even if they had worked, there is little or no science involved. There are no descriptions in the instructions that teach about the reactions or chemical processes that are taking place. Other reviews have mentioned that it was a lot of fun for their kids and it is on some levels, but my daughter (age 7) is intensely interested in conducting experiments and understanding why things work. If your child is similar, buy something else!