TY - JOUR T1 - On the Colours of Mixed Plates JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 128 SP - 73 EP - 77 PY - 1838/01/01/ UR - http://dx.doi.org/10.1098/rstl.1838.0006 M3 - doi:10.1098/rstl.1838.0006 AU - Brewster, D. ER -