If you wanted to create fake TFL signs I would start here...
Not that you should.... 8)
(tadd31, Wed 12 Dec 2012, 10:53, Reply)

I thought it was K for "key", not "kohl"
Though I'm not sure on this, tbh.
( Tab Hunter You used to call me sadness...., Wed 12 Dec 2012, 10:59, Reply)

K for key line...?
Used for aligning the CMY colour plates, I thought. Doesn't have to be black...
( FridgeBadger, Wed 12 Dec 2012, 11:40, Reply)

RACIST!

(pissflaps., Wed 12 Dec 2012, 11:44, Reply)