Designed for precision and smooth ink flow, these porcelain pens are ideal for detailed designs and creative projects on ceramic, glass and stone surfaces. ???? Dishwasher Safe, Permanent & Waterproof Once fully cured, these porcelain paint pens are permanent, waterproof and dishwasher safe up to 50°C. Your designs remain bright and intact even after repeated washing, making them perfect for decorative ceramics and glassware.