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I would very much doubt that the fuel was liquid hydrogen and oxygen simply due to the colour of the smoke. It must have been solid fuel for the boosters also indicated by the 700 odd degrees needed to make it combust. Very little energy is needed to get hydrogen burning in oxygen.
I imagine it would be APCP (ammonium perchlorate composite propellent) or something similar which uses several binding agents which could account for the yellow smoke.
Mark
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