A TRAINING METHOD
'Thou shalt not fiddle', is basic advice, which found me exploring another device.
To give broad, soft tones smudged onto the paper, I made giant 'Q-tips, ends cut to a taper,
Each of my students was thus equipped -into dark grey powder the soft end was dipped
Then felt tip exploited the base that was there, spray-fixed with water and suitable care.
Those excellent students responded so well. Was this my demo? I really can't tell.