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Mervyn Passmore 2008
Marblack Slate Blacking Home

Now apply Marblack Slate Blacking using a cloth and disposable gloves. Marblack is not harmful to the skin, but it can be hard to remove, and the black pigment has a tendency to spread from fingers to garments, and anything you subsequently touch.

Rub the Marblack liberally into the surface using a rag, carefully avoiding the waxed inlays. Rub it in thoroughly, using a circular motion, to ensure some soaks into the surfaces.



First coat in a circular motion

Using an artist's paintbrush, make sure some Marblack runs into the cracks in the joins. This will run into the white plaster that holds the case together.

Run Marblack into the joints with a brush

Avoid touching the inlays with Marblack, and where necessary use an artist's paintbrush to make sharp lines where the inlay meets the case.

When the Marblack has dried thoroughly (and overnight is best) apply a second coat. This time apply sparingly, and try to even out the surface. Wipe the sides in straight lines from front to back. Wipe the top from side to side etc. This thin coat will make a more even finish.

 
Second coat, in lines 

Allow to dry thoroughly.