Minimising graphite shine in a photo of a drawing

This tutorial shows the method that I use to minimise the graphite shine when I photograph my drawings. 

I have previously mentioned this in the additional information that I added in the description below my Tutorial on the way that I photograph my drawings, but here I clarify the method and give some examples of its effectiveness.

This is one of a series of tutorials that I have recently submitted.  The others are:
                            Barrel Distortion Correction       
                            Perspective Distortion Correction                 
                            Histogram Adjustment

Here is the link to the gif that I mention at the end of the tutorial that shows the benefit of the dark cloth even under apparently good conditions, with no light source behind the camera. Orphan Girl  from Myanmar