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/usr/share/crawl/settings/food_colouring.txt is in crawl-common 2:0.10.3-3.

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### Colouring of corpses, depending on whether you can eat them, and
### whether it's safe to eat them.
### Use menu_colour (inv) to colour items in your inventory or the
### pickup menu.

inv := menu_colour

inv = $inedible:.*inedible.*

inv = $evil:.*evil_eating.*

inv = $preferred:.*preferred.*

# Corpses of undead (necrophages etc.)
inv = $rot-inducing:.*rot-inducing.*

# Mutagenic corpses/chunks
inv = $mutagenic:.*mutagenic.*

# Poisonous corpses/chunks
inv = $poisonous:.*poisonous.*

# Contaminated corpses/chunks
inv = $contaminated:.*contaminated.*