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.
Because solvents (for cleaning up or softening) and thinners (for diluting or extending) are useful not only in painting but in other areas such as modelling or mouldmaking/casting I have given them their own sub-section here. Many common solvents (such as water, acetone or white spirit) can be used equally as thinners, though not all. Some may be needed only occasionally and then only for special purposes so itâs often difficult to remember what each can do.