devil302
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well they dont give shades but its new engine when petals are in blue shade and as the time passes they fade away due to heat find pics of any same serial number jet from block one u will see diff
That's actually the color of the metal/alloy in the nozzle petals. It's due to the technological differences between Russia and the West. The Chinese nozzle petals look different than both. You'll also notice, that apart from the colors, the layout of the petals is different in all three as well.
You'll see this dirty color in most current Russian jet engines.
Rd-93,
Even this display of the AL-31fn,
They also at times give obvious shades of blue.
And then we have the Chinese engines,