ATE Blue is still available, but only for "off road use" as the DOT has now mandated that all brake fluids be clear to pale amber in color.
With a good light on the clear tubing, you should easily be able to see the color change on amber brake fluid.
I would not use any brake fluid that is more than 3 years old and in an un opened car (should have a seal). The fluid can go bad just sitting on a shelf.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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