1. While in college I spent some time as a server at a couple of different restaurants. We used a product called a Ketchup Coupler to combine the ketchup in the bottles to reduce waste. Hello, paint jugs! Now, this doesn't work quite as beatifully as I imagined because the top of the bottle is a bit larger than a ketchup bottle, but it does work and has already saved me some paint. I got mine as a two pack online for less than $15 (I don't remember exactly).
2. We have a new art teacher this year, whom I get to mentor. She has a broad background and extensive knowledge in ceramics. She told me that there is a type of underglaze that DOESN'T stick to the kiln! It's called velvet underglaze, and it isn't glossy when fired. My mind is blown, and I now have a pint of black velvet underglaze that I use to paint students' names on the bottom of their projects. No more trying to read carved names!