I replaced my plugs and took a good look at them. They all looked good except I am a little Leary of the #1 cylinder. 7 of the plugs are a nice tan color. The #1 cylinder is more of a gray color and is the top photo. The rest look like the 2nd. My afr’s are low 13s at wide open , cruise is in the upper 14 range. Idle is upper 12s . Dart single plane intake , QFT 850 carb.

Shoot for mid 12 to upper 12 @wot. Cannot help abbout reading the plug color.

Cruise AFR is too lean. I prefer 12.8 to 13.2 at cruise progressing towards 12.5 at WOT (naturally aspirated) with reasonable timing.

No way to really tell anything from plug color on plugs that have been run at various rpms and at idle for hours.