The flame isn’t very visible, but a little salt in the fuel can help make the burn more orange. Of course, this is a flame, so you need ventilation. You’ll also want to take care to make sure ...

According to the USDA, "long-term flame retardants contain retardant salts (typically fertilizers ... Retardants can also burn your eyes and sensitive skin. Officials do not recommend using ...

[Paul Stoffregen] has made use of this phenomenon in a flame detector that he’s built to be installed on a Burning Man flame-based art installation. It forms part of a response to a problem with ...