Without full knowledge of the product I don't want to tell a lie, but I would have to assume looking at it it is made from the same line material that brake lines are. This would be a teflon inner liner, surrounded by a sealed stainless braid. Having said that ATE, Motul, Castrol, or any other quality brake fluid should work.
As for your slight "OCD" regarding the coloring maybe consider using a product like Firesleeve to protect it and make it more "stylish". Check the kits out
HERE. Its a protective outter sheathing and comes with a finishing tape to make it look seamless with the line. A little overkill, but something to consider.
Hopefully z1motorsports wont chime in and make me liar!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com