[Stoves] Purple flame

[Kevin C]

Dear Frans

Is it possible that the purple coloration of the flame is due to  
potassium from wood ash?

Is the reddish coloration of a flame perhaps due to coolness? More  
specifically, for example, if the TLUD was charged with fuels of  
different moisture content, would the flame from the dry wood tend to  
be blue or yellow, while the flame from the wood with higher moisture  
content tend to be orange or red, simply because of the higher  
moisture content lowering flame temperature?

Best wishes,

Kevin

Quoting Frans Peeters <peetersfrans at telenet.be>:

> Dean
>
> Potasium spectral colour is 440nm purple
> CO blue             not verry energetic !
> Hydrogen nearly invisible blue
> Sodium yellow
> Aluminium blue
> Copper green
> Strontium red
> Now you can start a fire Works bussiness
>
>
> Regards
> Frans
>
> Hi Stovers!
>
> I've been noticing a shift from blue flames above the burning bio-char in a
> TLUD to purple flames nearer the end of the burn when the bottom of the pile
> is glowing bright orange. I suppose that the blue flame is caused by burning
> CO but I wonder why the purple forms after the blue? The blue self
> sustaining flame doesn't heat the water in the pot as well as the purple
> flame phase although the pile of bio-char is fully ignited at that time and
> may account for the more rapid rise in water temperature.
>
> Any ideas?
>
> Best,
>
> Dean
>
>
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