How do I read my plugs ?

[1968Droptop]

I'm going to guess at plug range. How can I tell if it too hot or cold ? What do I look for/at when pulling a plug ? I know to look for detonation, anything else ? Thanks.

[502 JET]

Reading spark plugs guide (http://members.uia.net/pkelley2/sparkplugreading.html) Its from the tech links in the gear heads section.

[Strip Poker 388]

Reading spark plugs guide (http://members.uia.net/pkelley2/sparkplugreading.html) Its from the tech links in the gear heads section.
thats from Larry Meaux site,he is one of the best in the biz!!!