alc wrote:Yes officially 1&2 can be acceptable but where is description of aluminium , barium ,... effect ?
Please feel free to share any information in that regard.
Details (colour, shape, pattern of clouds) of the use of Aluminium and Barium in the atmosphere will be interesting to note.
I'm not certain how credible of a method it is to identify visually via cloud shape, colour or pattern, unless it looks like 3).
So what is the differentiation of a colour created artificially versus naturally?