Is a Carbon subnitride [dicyanoacetylene] fire non-toxic?

[Green Xenon [Radium]]

Hi:

Dicyanoacetylene [carbon subnitride] produces that hottest type of fire.
Does it burn clean, like methane? Or do its flames produces toxins?

Methane is clean because its combustion by-products are only CO2 and
water. What about dicyanoacetylene?

http://en.wikipedia.org/wiki/Carbon_subnitride

"bright blue-white flame at a temperature of 5260 K (4987 蚓, 9008 蚌)"

Thanks,

Radium