Hi all 
I recently bought the Bohin chalk cartridge pencil at a quilt show (on the advice of a complete stranger who was looking at the same display at the time & said she uses them & loves them).
The set comes with mostly white cartridges and also various colours. I did my test pieces using fabric from the quilt I'm working on. It's mostly darker shades but also some light.
Here comes my scientific method :
- all fabric was unwashed.
- I drew a line in permanent marker dividing each piece in half & marked one half as "Ironed".
- I marked each half with strong / dark marks of each colour & ironed the half marked as "Ironed".
- I then left them all sitting around for a few days in the sun.
- Washed after a few days in the normal wash.
Results :
- The white marks washed off okay but the other colours left stains on the fabric.
- There was no difference between the ironed half & the non-ironed half.
- some of the colours, like the yellow, showed even on the darker fabric.
So I'm very carefully using only the white on my quilt top as that seemed to be the only colour that washed out completely & I'm making sure not to make the lines too dark.
Does anyone have any experience with these?

I recently bought the Bohin chalk cartridge pencil at a quilt show (on the advice of a complete stranger who was looking at the same display at the time & said she uses them & loves them).
The set comes with mostly white cartridges and also various colours. I did my test pieces using fabric from the quilt I'm working on. It's mostly darker shades but also some light.
Here comes my scientific method :
- all fabric was unwashed.
- I drew a line in permanent marker dividing each piece in half & marked one half as "Ironed".
- I marked each half with strong / dark marks of each colour & ironed the half marked as "Ironed".
- I then left them all sitting around for a few days in the sun.
- Washed after a few days in the normal wash.
Results :
- The white marks washed off okay but the other colours left stains on the fabric.
- There was no difference between the ironed half & the non-ironed half.
- some of the colours, like the yellow, showed even on the darker fabric.
So I'm very carefully using only the white on my quilt top as that seemed to be the only colour that washed out completely & I'm making sure not to make the lines too dark.
Does anyone have any experience with these?
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