Be careful not to burn it too far as it goes very brittle. When you get the effect you want, wash it in a liitle soap and water and I rub clean with a wet wipe. This takes off any charcoal which may get on your work and cleans up the surface for additional colour.
I will now cut this up into sections and etch before embroidering and joining to the main piece.
See how I joined the roadkill metal sculpture on my website.