spark plug color
 

I have a 95 accord ex 2.2 vtec with 155k on it and she runs great but I pulled the plugs yesterday to see how they were burning and I noticed they had a greenish tint to them. What's that mean I never saw plugs like that. Its like copper corrosion green if u leave it in weather to long. Could that be some junk in the gas im useing? All 4 cylinders are the same exactly. I thought Maby it was burning antifreeze but I never notice the level going down. I never had to put any coolant in either. Any idea? Maby burning too hot? Or should I switch plug brands. What goes best with Honda's. I know certain vehicles u need to run certain plugs/ wires or they won't run at 100%

Hondas like NGK plugs. Or Denso. People have told about problems with Bosch, but I've used Bosch with no problems & no green color.

Leaking antifreeze generally makes the plugs all clean & shiny. Like steam-cleaning.

Somewhere on NGK's website there's a set of pictures of sparkplugs, showing different things like lean, rich, too hot, too cold, etc.

The website said its from oxidation and the dye they put in gas. Sometimes a common thing among autolites. Im gonna switch to ngk anyways. Idk how it would be oxidizing thou.

I've heard of strange colors coming from fuel additives, but usually from extra junk that people pour into their gas tanks. I'll have to remember about the green stuff...