system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If vodka, whiskey and gin are all made of grains, why is only whiskey brown?

And meanwhile vodka and gin are clear?
gpt
Whiskey is aged in barrels where it gets it colour. The barrels would have some char and the interaction between the wood and liquid give it it's colours. 

Sometimes caramel colouring is added to whiskey to a certain colour but doesn't affect flavour.