Bic you can buy Magura Royal Blood (blue) from
http://www.evanscycles.com/ I know beacuse I bought mine here or of course KTM. I do have a load of Putoline 5wt fork oil here, if you want to use that just let me know and I'll drop it off.
I found that the best way to get all the old fluid out is to pop the callipers off one at a time, starting with left. Clean the pistons so any shite is removed and won't damage the seals when they are fully depressed back in. Then push each piston back into the calliper, you need to draw all the old fluid out of the reservoir with a syringe as you go. Once all the pistons are fully back in the calliper then you know the calliper is 95% empty of old fluid. Draw out remaining old fluid from reservoir and fill with new. Refit calliper and pads, fit bleeding line to that calliper, fully open and push through some clean fluid. Now you should have all the old fluid out of the system on that side and the master cylinder and line to left. Now just close bleed nipple and pump through clean fluid until all pistons are back out. For the right side I take off calliper, clean pistons and refit calliper. Fit bleed line, fully open and gently push back each piston with a screw driver of similar. Once all 4 pistons are fully back then close bleed nipple, refit pads and pump fresh fluid through untill all pistons are back out again. Then a quick bleed of both callipers and the master cylinder just to be sure there are no bubbles in the system. Slightly long winded but you really want to get shot of all the old fluid and not just whats in the reservoir, master cylinder and lines.
Oh and no doing a Superdan and using Magura Royal Blood as brak fluid, then telling a buddy to take her out and try the slipper out the clutch to see what it feels like. Only to have the brakes seize on 2 miles down the road in the middle of the road