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I think one company makes DOT 3 or 4 in two different colors, so you can tell when you've fully flushed the system. Something I read about a long time ago, but I haven't heard anything about it for quite a while.
There was a lot of information in that article (probably way more than I ever wanted to know about brake fluid). I wonder how much of this has any real impact on the average daily driver.
I think one company makes DOT 3 or 4 in two different colors, so you can tell when you've fully flushed the system. Something I read about a long time ago, but I haven't heard anything about it for quite a while.
If you're unsure of what's in your system, put a little bit of what's in the master in a jar and add a bit of water. Silicone won't mix with water, the others will.