Stop in for a cup of coffee

71GSSDemon said
I believe it to be oil or coolant. Not sure what that looks like in comparison. Also, I can't figure out why the rest of the plug is clean

Did it even develop a spark kernal?
I'd expect some indicator of flame development.
Here's where a scope and some experience with it could be helpful.

Check the secondary wire and cap for anything different on that cylinder
Put a different plug in and see what happens.

Maybe run a spark tester in line to see if spark look weak.