Hey there folks,
I was just on the phone to my favourite magic shop so far, and asking about loops and IE. I explained I had just purchased some IE from elsewhere and it was white but as I understood the best stuff was more the grey/brown of your typical IT, the dude said "Oh that's easy, just run a sharpie down it"!... Genius, I never would have thought of that. I may be a little presumptuous here as it's a method I've yet to try until my order arrives but thought I'd share it.
It may just be me being a bit slow but I never would have thought of that. Novice I am, but this is for others like me
I'm sure there is much to be debated about the different qualities and expence of such products but thought this may be a useful tip, I'll post an update when I get my stuff!