why is kerosen blue in color? is it harmfull? why it is blued?

Question

Why kerosen is blue in color? is it done that way? why it is blued? how to fade the blue color of kerosen?

Answer 1

Kerosen is actually colourless. They put blue colour dye to differentiate between water. I remember a time when Kerosen was pink in colour and my mother says it was colourless when she was young.

Answer 2

It's blue becauase they add a dye to it (usually ethyl automate blue or equivalent - NOT copper sulphate as some other ***** suggested). Why - so you don't confuse it with any other clear liquid (eg water) and, at the refinery, to differentiate it from all the other liquids (gasoline, diesel, avgas, etc - all of which are ALSO coloured so you can tell them apart).

In particular, kero used to be coloured blue to differentiate it from Jet Fuel (JET A-1). Kero and jet fule look the same, smell the same, have the same density - and, in fact, ARE the same product - except for one very specific property. Jet Fuel has an anti-icing agent added to it so that it passes a cold flow test - if you used "standard" kero in this application BAD THINGS HAPPEN, like the jet dropping out of the air!

Of couse, in some countries the kero market is small and the jet fuel market is large so they produce DPK (dual purpose kerosine) - so, basically, all of the kero sold in those countries meets the Jet standard, but is coloured blue so that you DON'T fuel aircrafts with it ('cos it usually attracts a diferent excise tax rate).

Answer 3

cooper sulphate is mix in kerosen so it is not mix in petrol or desiel.my removing that compound.