While we usually think of them as being streeks of white, occasionally they appear in different colors.

It’s just not usually visible to the human eye.

India-based photographerSoumyadeep Mukherjeemanaged to capture this sight in a series of stunning photos.

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee

Mukherjee went out with the intention of snapping pictures of the ISS transit of the sun.

However, due to some unexpected clouds blocking the sun, he was forced to abandon that plan.

That was when he photographed something even more amazing.

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee

The colors in plane contrails are due to individual water droplets diffracting sunlight.

Each image is actually a composite of seven individual images captured over a period of 40 seconds.

As a result, each photo depicts the changes in the iridescent colors and shape of the plane contrail.

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee

I quickly zoomed my lens at 600mm and was very surprised to see some colors on the contrail.

Mukherjee elaborates that his location in Kolkata, India, makes it very rare to see contrail iridescence.

The colors were faint and not visible to naked eyes, he says.

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee

Had I not zoomed in with my camera, I would have missed it completely.

India-based photographer Soumyadeep Mukherjee captured rainbow contrails from planesa spectacular and rare optical phenomenon.

Each shot is a collage of seven images taken over a period of 40 seconds.

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee

Photo: (left) sundog phenomenon; (right) iridescent plane contrail

Rainbow Plane Contrails Photos by Soumyadeep Mukherjee