I don't believe color is relevant. The DOT ( yep our government at work again) has dictated the colors of fluids used in automobiles. The ATE blue racing brake fluid is no longer as DOT forced them to stop using blue dye and dictated yellow/amber. This is posted in a letter on the ATE website. Seems the DOT thinks it is less likely to cause confusion and errors in placing an appropriate fluid in the correct reservoir if we have a systematic color scheme.