Board Thread:General Discussion/@comment-26031425-20150122050211

Been looking online for why Toothless' dragon fire is purple, the only thing i can think of is that NightFuries in particular has a higher concentration of SaltPetre or Potassium Nitrate or Magnesium Nitrate in their bodies. These are ingredients for fireworks. So if the flame is red or orange/gold then it would have a higher concentration of Sodium from salts and Calcium from almost anything like bones or shells. The dragons have a higher concentration of these substance in their body or its stored in some sack/bladder so they spit it out when they breath fire out.

Toothless' blue flame is said to be really hot so it's probably a mixture of dicyanoacetylene, cyanogen, acetylene or diacetylene gas that would react with the Potassium or Magnesium Nitrates to produce the purple color when it explodes. The Potassium or Magnesium is being burned at such a high temperature that their emitting a purple color for their flame.

As for the Bewilderbeast's ice blast, it's probably using a lot of ice nucleating bacteria or protein in it to make the ice. Considering that the ice had not melted, the ambient temperature around Berk is probably near or below zero degrees Celsius and most likely would still be there even after hundreds of years as long as the temperature doesn't rise.

Something to consider, i mentioned this in the HTTYD fanfics in fanfiction.net that the dragon dung and urine could be used as explosives or fuel. Anyway pls comment and see if anyone else got an idea as to why Toothless' dragon fire is purple. 