I seem to recall that when hydrogen burns the flame is a very pale blue, almost invisible in normal light. Are they going to add impurities (pollution ) to make the flame visible ?

This appears to be another case where symbolism is taken to an extreme.

Actually a hydrogen flame is invisible when burning in a lab environment where the only oxidizer is the oxygen that Is supplied from air.

I do see a blue flame on my "water torch" which utilizes pressurized oxygen, but I think that color is coming from the oxygen burning.

If the Olympic torch is set-up to produce the blue flame, then carrier would also need to tote a pressurized tank of oxygen as well.

then the question begs: what is the actual carbon footprint after fabrication of the extra oxygen tank (most likely made of wound Kevlar/epoxy for weight), pressurized Hydrogen tank (which the engineers and scientists know that issue), the electrolysis to make the hydrogen and Oxygen, and pressurization equipment to fill the tanks.

Logic and emotions are often at odds.

Oxygen can't burn, but it definitely helps other things burn. Most flames that people are able to see are ionized combustion components.

https://en.wikipedia.org/wiki/Flame

I can have other colors under different fuel ratios, relative humidities, etc, just like other flames. I'm sure they can figure it out... also, a torch is a torch.

Well I think as long as were not running out of fuel we might as well use something else we have another adntage with and oviosly not running out of.