Originally Posted by ghostrider

Try the Sewline ceramic pencil. Leads come in gray, white, pink, yellow and green...though some have had trouble removing the pink, yellow, and green lines. Lines are very thin and can be erased or come out with water. I use a wet brush cuz I think the eraser stretches the fabric. I love mine and wouldn't be without it.

Prism, perhaps a cheese slicer to sharpen your soap?