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.
When it comes to dimensional work nothing beatsStudio High Viscosity acrylic paint, with its thick consistency and satin finish, it retains brush or spatula marks. Studio Fluid Acrylic, which is fluid with a satin finish, is suitable for detailed work. Applied with a brush, it can be used for fine, regular lines, glaze effects and watercolour effects. It is guaranteed free of environmentally harmful heavy metals. Colour Chart (pdf) Product Information (pdf)