Here's the supply list for our cyanotype coaster class.
To make cyanotypes, you'll need a set of cyanotype chemicals. I like Jacquard brand, but there are many out there.
You'll also need watercolor paper (or other art paper that can handle water). I like Canson, and 140lb paper will be thicker, while 90lb paper will be a little on the thin side.
You can also buy pre-sensitized paper, but I find the quality of these to generally be poor and not great for a project like this.
Then, to transform them into coasters, you'll need: