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Just wanted to put something out there for diving teens. My diving daughter needed to do a Science Fair Project so she decided to do "the absorption of colour underwater" She did up a laminated rainbow of colours on a slate. We dove to 100' and she held it and I took a photo, then we repeated the same picture every ten feet to the surface. She then did the display up with all the pictures and some physics diagrams explaining what was happeneing. It was very well recieved by the judges..., and we got another diving day as a bonus