I think the guys are mixing too many things. In France analyzes were made to the juices of a brand and contained heavy metals, probably from the metal barrels where came the PG, some dented, rusted other outside (and possibly inside).
The Farsalinos always mentioned that one has to improve the quality control of liquids, the main reason I do DIY, and the material that is used, Chinese tanks etc. Attys that bring rusty washers or brass in contact with the liquid as some attys I've seen around with poles in brass. All this can contaminate an e-liquid and result in particles and heavy metals in small amounts in steam.
This controversy of hexevalent chromium has appeared makes a 2 or 3 years when a user of the ECF paid $ 5k 3 test each one to see what it was that black powder forming on the metal mesh of genesis. The genesis attys were the hype of the pros, and who did not use genesis was unaware of steam, and bam, today there is almost no one using genesis because of this controversy.
At the time it reached the conclusion that heating the kind of metal, stainless steel supposedly between 600 and 700ºC formed such that hexevalent chromium VI which is carcinogenic. Few studies have been done after that.
I know kanthal is made up of iron, aluminum and chromium, know that the nichrome and nickel more chromium. It will be the chromium heated to these temperatures that creates that? then why this has been tested and found in metallic stainless steel mesh that had to oxidize not to be conductive?
They realize where I say that there is here one big mix of opinions and each throws his set to air?
I still do dry burn in my coils, obviously to clean and without abuse to be as hot as the wire breaks. Just reach a 400 ° C to turn orange and clear that it has, then go through water, pass it a scarf to clean it, step by water, and see if everything is okay. If it is, ok, clean, the vape as new, i vape and sleep rested.
Again I will not panicate with this situation, I realize why the advice but I think we are hypochondriacs, and we base ourselves on opinions and not facts.
To us basing on facts you need to make up studies and tests, and these are very expensive.
If the SS was proven how such black dust that is bad, but that did not prove that there was indeed passage this mesh powder to the coil for steam and our lungs, no one has proven anything at all like that in the coils and we come here to say that we think, based on wisdom x, and I'm much good at it and all so, realize, is just that, opinions.
If you want to be safe as they see fit, avoid this or that or nothing of it, but do not enter is a mass hysteria because kantha have become a green monster that kills everything if we make it a dry burn. If this is established, it is with facts.
Also a juice or very Ry4 or VG in two days kills a coil, is full of burnt sugars that do not turn into steam so it forms "coal" in the coil, and prime 15 i can vape 30 or 60ml if you have virtually no vg as the halo seems to do, have got to use a coil for a month, got a peek and the wick was almost transparent bright white, with the coil as new.
Is not linear, it is not a + b = c. We need to know if the black powder is sugar caramel not turned into steam, or is chromium VI hexevalent, or if dust of our living room. Or if we're all just getting dumb because farsalinos and tiko said something that may or may not be.
This is my opinion about it, and in this matter while no studies, and evidence, I have no more interest. Not now that tested the e-cig on the other, and has iron.
But ancient tests tested ce4s the beginning and cartos, which never took one dry burn, and had metal particles ... HEY ... may even be liquid. Or discover the reasons or we are here in the land of opinion basically.
A hug and good Vapors everyone.