I know in the US you guys have had a yellowish coolant. Here in Oz ours has always come from Germany and it is a very deep blue. Even when mixed with water it is still very blue. There is nothing green or yellow about it and it is easily distinguished from the common green ones. I had heard that the blue stuff was also possibly now available in the US.

__________________
107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.