I know about water vapor trails behind planes, what about the ones that actually become clouds w/weird colors?

Question

I often see unmarked planes that don't fly in commercial airpaths that leave trails in the sky, sometimes up to a dozen of them at a time, sometimes parallel to each other, and sometime perpendicular. After a while, these clouds spread out and either become a haze or become "clouds" and when the sun passes behind them there is usually a rainbow of pink and yellow, and sometimes green, definately not normal.

I know all about water vapor trails (con-trails) but those dissipate rather quickly (usually within a few minutes), but these clouds stay all day and end up creating weird colors and patterns in the sky.

Please visit my gallery of pictures I took at http://weathermodification.shutterfly.com to see what I'm talking about if you don't already know what I mean.

Answer 1

You are referring to "Chem-trails." Supposedly the government or some shadow agency is testing various chemicals on the environment or American citizens (depend on which "investigator" you talk to). Chem-trails are usually distinguished by heavy air traffic in an area, often times forming a criss-cross patterns. Such reports are also often accompanied by unexplained sickness or asthma. On occasion, someone also claims that the chemicals will produce odd substances on the ground the next morning (sometimes described as a crystalline structure, other times spider-webby).



Your pictures, however, only show one trail (which appears to be a con-trail) and some pretty clouds (probably the result of pollution, though other natural explanations are available as well). In all likelihood, your pictures are nothing more than scenic.



As to if chem-trails are real, I've never seen a reliable source report them, nor have I ever seen any compelling evidence put forth.

Answer 2

Normal aircraft flying at high altitude,they don't have to be jet aircraft,either,piston engines leave the leave the same smoke!trails,witch is actually a vapour trail(h2o) caused by the fuel burning .Some engines actually have water injected into the fuel mix to make them more efficient too.

Answer 3

These contrails are just droplets of water, so they refract light in different ways to produce these colors. Same effect as a rainbow.