This might seem strange but what you are looking for is called Wax-based Tailor's Chalk. It is easily removed by ironing which is really convenient. I thought wax based was the only type of Tailor's Chalk so I was caught off guard when I bought some, I think Dritz, and it would not iron away. I found clay chalk much harder to get rid of. I Googled Wax Tailors Chalk and this came up on Amazon. I did some additional research and found this manufacturer's page with a description of the two PaintMarkerSource.