[mass noun] A deep rich brown.
- ‘Kallitype is one of a number of printing processes in the iron-silver family, along with, among others, Vandyke brown and argyrotype.’
- ‘The 18th century choice of natural earth pigments typically included raw sienna and Vandyke brown or Cologne earth.’
- ‘The Vandyke brown print is based on the first iron-silver process, the argentotype, invented in 1842 by the English astronomer, Sir John Herschel.’
- ‘The Vandyke print gets its name from its similarity in color to the deep brown pigment, Vandyke brown, used by the Flemish painter Van Dyck.’