How to read spark plugs over time?

I know how to read spark plugs but over time, would a reading be accurate? Have a Honda whose spark plug is maybe 2 years old, would its reading still be similarly accurate as if it was only after a first good week of use? Stock everything, the porcelain is black, I'm upjetting now with a aftermarket exhaust and filter, should I upjet with if the porcelain is black? With the length of time? Should I try a new reading with a new plug? (Already installed one)

Dry Blacked plug = Too rich/Too much fuel in the cylinders

Blacked plug lightly wet with oil, Misfire plug is not firing

Blacked plug heavily wet with oil,= Broken rings bad valve stem seals. Bluish smoke from the exhaust

Light gray tan deposits on tip= normal operation healthy engine.

Plugs will last years and several miles

If that part is black you should check your coil(s) or plug wires. The section of the plug you are talking about is NOT in the engine, right? If those are black, you need to be sure your spark is getting to where it needs to go.

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