“Burn shavings and splinters of pitch pine, and when they turn to charcoal, put them out, and pound them into mortar with size. This will make a pretty black for fresco painting.”
Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book VII, Chapter X, Sec. 3
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Vitruvius 203
Roman writer, architect and engineer -80–-15 BCRelated quotes

version in original Dutch / citaat van J. H. Weissenbruch, in het Nederlands: Als het stormt en regent, als het dondert en bliksemt ben ik in mijn element; de natuur moet men in werking zien. Dan buiten, trek ik mijn jekker aan, steek mijn voeten in klompen, zet een soort hoed op en ga op marsch. Als de buien bedaren, met houtskool of zwart krijt een krabbel gemaakt om vast te houden wat je ziet. Bij het uitwerken komen toon en kleur vanzelf in de herinnering.
Source: J. H. Weissenbruch', (n.d.), pp. 29-30

On the still existing obstacles to pitching ideas in “Lena Waithe Is Changing the Game” https://www.vanityfair.com/hollywood/2018/03/lena-waithe-cover-story in Vanity Fair (April 2018)

Richter's aunt had been murdered by the Nazis in the name of euthanasia, a crime for which his father-in-law from his first marriage, a Nazi doctor named Heinrich Eufinger, had been partially responsible. Richter painted a portrait of his aunt in 1965, based on an old photo. It was called 'Tante Marianne' / 9Aunt Marianne).
after 2000, Gerhard Richter: An Artist Beyond Isms' (2002)

Source: Dr. Heidenhoff's Process http://www.gutenberg.org/files/7052/7052-h/7052-h.htm (1880), Ch. 1.

Source: De Secretis Operibus Artis et Naturae et de Nullitate Magise, Ch. 11, in a reference to Bacon's knowledge of making gunpowder, as quoted by Thomas Thomson, The History of Chemistry (1830) Vol. 1, p. 36.
Source: Mike Flannagan (October 1, 1992) "TV Artist Bob Ross Watches Paint Dry, Turns It Into a Successful Career", The Knoxville News-Sentinel, p. B1.