Colouring is really easy dude. If you've got a regulated mod set it for 40w, set your coil up, scrape it before you begin heating to try work the hotspots out at this stage. Then just pulse lightly until you see the beginning of the glow then stop. It should go kind of gold - orange at this point if you haven't added too much heat and the hotspots were worked out. Then just repeat the heating process, slowly heating and then stopping at the beginning of the glow. Can do that a few times to get different ranges of colours. Hope that helps dude
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