Orange flame gas hob

[johnny2007]

Hi everyone,
This is a new (6 month old) bosch 5 burner gas hob fitted by gas safe registered engineer.
It's super clean as the boss keeps it that way.
The other night all burners were giving out an orange flame.
Carbon monoxide detector didn't sound alarm (one burner was used for 5 minutes and the others only tested).
Then in the morning and since then, the flame returned blue.
Could it be some contamination coming from the main gas supply?

Thanks

 

[jeff the gasman]

Cleaning chemicals.

 

[johnny2007]

In the pipes from the main or the chemicals used by my wife to clean the hob?

 

[jeff the gasman]

The ones your wife uses.

 

[Madrab]

If they all burn like that it'll be either something in the air or on the burner, as long as the crown airways are clean.

 

[kidgreen61]

Do either of you use a Nebuliser?
They will cause odd coloured flames.

 

[johnny2007]

No, no nebulizer