What type of pen do the “pros” use to personalize dough ornaments?
Sharpie markers do work, but they will give you a washed out look. For a shiny look, go with a metallic or shiny paint pen (available at most craft stores). Look for one that has permanent, waterproof ink for the best results. They can be a bit pricey, but they are worth the investment, especially if you have a large number of ornaments to personalize.