Hey Mr IlkkaTalvi!

I just read your blog about the inventor of lighter-than-airships. there have been many studies of the Hindenberg disaster. KCTS has run one. It seems that the fire was caused by static electricity and the culprit fuel was the aluminum based paint. The hydrogen burned, of course, but it was the paint that caused the red flames and the smoke. Hydrogen has a colorless flame as it's only product of combustion is water vapor.