[ #4 chestnut](http://en.refectocil.at/product/augenbrauen-und-wimpernfarbe-
nr-4-kastanie/) is a wonderful, warm brown shade with subtle red tones, which
is ideally suited for clients whose hair is a warm red brown colour. Chestnut
is moreover ideal for mixing with other RefectoCil colours. By mixing in some
chestnut, the colour becomes warmer and is thus particularly recommended for
those with warm colourings.