I thought those fancy glass mixing vials were a must-have, but they cost me $50 for a set that broke in a week.
I bought a set of three from a pen show vendor, convinced they'd make my ink mixing look professional. The first one cracked when I was cleaning it with warm water, and the second chipped on the rim just from tapping it on my desk. For the price, I expected them to handle basic use. Now I just use clean plastic sample vials from Goulet Pens, which cost about a dollar each and don't shatter. Has anyone found a middle ground, like a durable but not crazy expensive glass container for mixing?