I am quite sure that the yellow material, formed in the smoke in this experiment is related to the results I recently obtained in another experiment
with thiocyanate:
http://www.sciencemadness.org/talk/viewthread.php?tid=27676
Apparently, thiocyanate has a very peculiar and not well-known chemistry. Textbooks for schools and even at university level are totally silent on
these yellow compounds, you have to look into specialist papers or some more obscure data sources to find information about this.
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