Tinting Mason Jars

I pinned this craft sometime over the holidays and finally got to try it out. The tutorial that I followed can be found here at http://www.momtastic.com/diy/168908-diy-tinted-mason-jars-in-rainbow I followed the steps, the only unclear things were the temperature that the oven needed to be on. I put my oven on 300, but if your oven has a warm setting, I would suggest that!