My friend Bonner has just set off to Charlotte Street to pack your picture (an old painting) and forward it; it is a beautiful representation of a summer's evening; calm, warm and delicious; the colour on the man's face is perfect sunshine. The liquid pencil of this school is replete with a beauty peculiar to itself. Nevertheless, I don't believe they had any 'nostrums,' but plain linseed oil; 'honest linseed' as old Wilson called it. But it is always right to remember that the ordinary painters of that day used, as now, the same vehicle as their betters, and also that their works have all received the hardening and enamelling effects of time, so that we must not judge of originality by these signs always.

Letter to Rev. John Fisher (20 December 1833), as quoted in Richard Friedenthal, Letters of the great artists – from Blake to Pollock (Thames and Hudson, London, 1963), pp. 45-46 - from Letters