Drug info - Brown coloured ketamine?

[k-explorer]

SWIM is a semi-regular ketamine user and he always gets ketamine from the same guy and it's always a bright white powder. He gets it as liquid and heats it/reduces it down. SWIM can't really say how good the quality is as he has nothing to compare it with but he seems honest and SWIM's always had a very good experience with what he's sold him.

Thing is, today he sold SWIM some that's light brown in colour and SWIM is a bit paranoid about trying it. He says it's fine and that ketamine is often "off-white" but SWIM suspects he burnt it a bit when reducing it down and SWIM is wondering if that's a problem. Is it safe? Will it affect the trip?