Corrected entry: Plutonium is not a red liquid, it is a white-silver coloured metal. Even oxidised in solution it would be paler than shown.
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Correction: It wouldn't be safe to use plutonium metal. Even with the suits on, both Marty and Doc would be subject to lethally high amounts of beta and gamma radiation. Chances are they used a dilute solution (possibly plutonium (IV) chloride as that is red in colour) and it is possible to deeper red is down to dye or impurities in the solution - the latter is possible as Doc acquired it from terrorists.
Andy Benham 6979