The Orange and Green NEW indiactors ???

I posted my inquiry (using feedback) a few days ago but have not received any type of reply which may be logical considering the other more pressing Dpreview priorities.

I would like to know the conditions where either Green NEW  or Orange NEW is displayed beside various posts.  Originally, when only one NEW this indicated that (the viewer, me) has not read this specific post.  Then when read, the NEW no longer appeared.

Presently, some are Green and some are Orange and others which I have not read will not have any type of NEW indication.

In fact, any that have either color NEW does not seem to disappear even after reading the post.

Will someone (that knows the details) please explain.

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Vernon...