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Hi Antony,
You wont see any colour on nebulae unless your scope is 12" or more and the sky is DARK DARK DARK.
I detected a greenish tinge on M42 from a dark sky (which is actually reddish purple) but with M8 or M20, you will see only greys. Clusters (Open or Globular) look like stars no matter which eyepiece you view them through, so from your descriptions, it seems more likely a nebula.
Whack a point and shoot camera up to the eyepiece and snap say a 10 sec shot if you can, and you MIGHT get some colour showing.....worth a shot.
Otherwise, view the 2 on Google images and try to determine which one you are spotting.
Nice going either way,
Cheers
Chris
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