What is a fabric marking pen?

Fabric Pens are very good for patterns but are not good at all for detail. The colours smudge together resulting into no detail. Fabric pens are good for writing as they have thin led but not for colouring in. Fabric pens are normally used to create a message onto a piece of fabric… When you have finished using the fabric pens you have to iron them into the fabric so the ink can set.