Difference in blue items and green

I have gotten a few green times and I know you can’t change them and they are doubled the Stat. So what are the light Blue times I just got 2 as drops and I also know if I add a crystal obsidian to a item it turns blue but what is the drop blue item mean and is it worth keeping?

You get the cyan affix for free without spending an obsidian. Some are useful, some aren’t.

…that’s it

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Oh… I know it’s a dumb question but can your reroll and randomize it to change it?

Yes.

OK thanks guys for the help.