It's becauase the argument passed to the chr() method is out of the range. Want to learn more Python for Data Science? Head over to DataCamp and try their free Python Tutorial
The second product used in this project is Liquitex pouring medium. This is a low viscosity (very fluid), clear, and high gloss acrylic medium. It is about the consistency of warm honey; quite sticky also. It can ben used with your regular heavy body paint to make them flow easier, and create cool dripping effects.
Simple Recipe for Thinning Paint. One type of gel medium thins paint, which allows the artist to build layers of paint over each other. Many paint manufacturers sell it premixed, but mixing it yourself lets you control the ratio of thinner to oil in the layers of paint you add to the project.