Mines are already color coded.
White is alright. Red is dead.
Bubbles are a different story but a good indicator is if there is a group of enemy players standing inside.
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There are also electric mines which are not colour coded.
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Shoot it. If it doesn't destroy it then it's fine.
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Thanks for the tip, I have never tried that with the electric ones.
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Most people don't think of it because it spouts electric instead of blowing up. Seems like Bungie would've made a PvP vs PvE FAQ.