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.
Paint the design onto the surface of the mug using acrylic paint. Read the instructions to ensure the paint is suitable for ceramic surfaces. Apply one layer at a time if applying multiple colors unless you want them to blend. Allow at least one hour for the paint color to dry to prevent colors from mixing.