Review on Optimize Your Mixing Ratios with Custom Shop's Calibrated Solutions by Richard Miller

I bought these for pouring and pouring but yesterday I suddenly realized I need to dilute the solvent 1:4 by volume with water. I took one of these with the intention of using it as a disposable container. I was pleasantly surprised to see how easy it was to use the ratio labels to get exactly what I needed without worrying about ounces or milliliters. I left the solution overnight to use the rest in the morning. The plastic held up well to the solvent, so when I was done I washed it off with a permanent marker and put it away with the concentrate to use again next time.