have tried searching but cant find any other posts with regards to my plugs.
have just changed today after 4k and look fine apart from the electrodes look to have shiny speckles on them (crap way to describe them i know ).
dont use any octaine boosters and always run on 99 fuel so no discolouration due to boosters etc...
any ideas ???

 

looks normal White too lean black to rich and golden brown just right