Exactly, op probably just traces the vein will releasing the liquid, we wouldn't see it within the vein because the blood would dilute it and the flow would Carrie it away as soon as it enters
What if he injected it in really fast and took a photo. Would that work? If he did it right and he had all the stuff it may be visible for long enough to take a quick picture.
Is no one else impressed that they some how injected it into their vain with that same hand? I mean it takes some nurses 3 times to do it right. That takes skill, especially for someone stupid enough to do this.
It depends on how easy the veins are to spot. Women are harder than men and the fatter you are the harder it is to find a vein. Even highly experienced professionals can struggle with difficult veins.
It looks like the idiot injected with one hand and had a camera/phone in the other hand and continued injecting it whilst the photo was taken, otherwise I think the blood would have carried it away. Someone else said it may have caused a blockage, also possible.
(Yes I know "do" stupidity)
"Don't. Just don't."
And three times? I'm sorry, that a shit nurse.
But really, it could not be glow stick fluid, since the pictures were originally on 4chan, the guy never said what was in it