colour of ash - aska

[Gäst]

while playing around with the ventilator-setting of my bequem50 i saw that the ash became dark-grey when i reduce ventilation.

which colour should the ash have, when the burner is working optimal? light grey or dark grey or black?

[Gäst]

any ideas?

[spliffan]

more to the light grey then dark i belive..