Green color on spark plug?

[Fletch]

I've searched not only here but the net to try to figure out what this green coloration is on my plugs, and I haven't come up with much.

Does anyone know what this means? Does it have anything to do with the temp range of the plug being off? This plug here is a NGK BP6HS, and I've gotten this green coloration on other plugs as well.

I read online that fuel additives can leave deposits, and I never had this before switching to Amsoil Saber. Could this be from the oil? Oxidization? I have no idea.

 

[motorpsycho]

it looks tan to me.

 

[srdavo]

I can see the green tint on the insulator part on the plug.

If it was only green on the north side of the plug, I would suggest moss.

Seriously....I have no clue.

 

[Fletch]

I can see the green tint on the insulator part on the plug.

If it was only green on the north side of the plug, I would suggest moss.

Seriously....I have no clue.

Ok... I'm gonna hit it with some Round-Up and hopefully that will take care of the situation.

 

[srdavo]

:laugh4:

 

[wildemere]

When tuning a 2 or 4 stroke engine, tuners look at the colour change at the base of the insulater, next to the metal body, deep inside the plug with a magnifier lens

This indicates the combustion temperature.

Its trial and error unless you have combustion software.

It takes a trained eye or special sorfware to see this.

Tip colour is just typically fuel type.

Or rich or lean.