How do I read spark plugs? I just put in some Autolite 5245'*. My iridiums I took out were sooty around the edge, with a definate line where the outer electrode meets the edge, then they were yellowish/pinkish on both electrodes and the ceramic at the base of the center 'trode was yellowed. A couple had some yellowish "crust" around the edges with the sootiness.
with you description and not seeing the plugs, it sounded normal to me too. i hope the chart helped. i have it added to my favs.
i make sure i pull a plug after every pass just to see whats going on in there