/usr/share/crawl/settings/standard_colours.txt is in crawl-common 2:0.10.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ### standard colours to be used for menu and inventory colouring
$inedible := darkgrey
$evil := red
$preferred := yellow
$rot-inducing := lightred
$mutagenic := magenta
$dangerous := magenta
$poisonous := lightgreen
$contaminated := brown
### standard colours to be used for message highlighting
$danger := lightred
$warning := yellow
$boring := darkgrey
$item_dmg := $danger
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