There was a problem uploading my file. :/ Basically they're pretty white with a sort of hot red glow around them. I have them just outside the tent now. The bucket is emitting a fair bit of heat, is that likely to be a problem? I'll put it on a heat mat but I mean in terms of melting the tent...
sanctioned-suicide.net
I'm still undecided on this myself. In the above thread, Zanexx entered with the charcoal. They took sedatives and, in their last post said they could sense the CO in the air and, felt short of breath. They succeeded with their attempt. I'm currently still tempted to copy Zanexx, but i have marfan heart disease, restrictive lung disease, and panic attacks, so i'm not sure about the risk of respiratory or cardiac arrest whilst still being conscious.
I think the consensus here is more to let the CO level build to 10,000+ppm and then enter. In theory, you should pass out very quickly and, reduce the risk of being conscious whilst experiencing respiratory or cardiac arrest.
It's just hard because the only detailed confirmed successful goodbye thread here is Zanexx's, i think. The thread also includes a link to an accidental CO tent death where a cool bbq was taken into a tent, so again the death occurred from gradual exposure to CO. I think this is how most accidental CO deaths occur - gradual exposure rather than walking into a space with 10,000+ ppm.
Then you have Bridgeluvr's experience of failing after entering a car after letting the CO build up to 7,000ppm: