one way to take a pict. of the sunset/sunrise.

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Seen this now, The White Balance on Nikon can easily adjusted pushing the WB button and turn your dial, to the left or right, you get more yellow or blue in your selected WB. see your Nikon manual for more details:
here's a part of it
White balance is how you set the color balance, and color is critical to every image.
I use AUTO WB, which is set by reset.
I prefer warmer images, so I set WB towards Amber (more orange) by pressing the WB button and spinning the front dial to taste. A6 is a lot of amber, 0 is neutral, and if you want cooler, B6 is much bluer. You read this on the top (or rear) LCD as you adjust it. It disappears when you release the WB button.

I usually run A3, but I'll use A6 in shade. It's not magic; just look at your p

The actual function:
The character K stands for Kelvin. Kelvin unit of temperature and represents "color temperature".
The color temperature is entirely dependent on circumstances and the time of day. Our eyes corrected with the brains of the color. A camera does this (yet).
For this you need a color temperature meter.
Previously this was not possible and that these color differences are hand-corrected during printing.
Because the color temperature meter can be determined and the appropriate value set.
So get the right color and obtain an exact right color under certain conditions.
What you are doing is actually using the camera, a special effect filter.

With Photoshop or a similar program could easily be applied.

just a bit of advise I need... Have got D90 as well but just recently am discovering/learning about manual settings. My back garden is west facing, so will have plenty of opportunities to play with the settings.

thanks for the idea. For me, most of the time, I use manual function and I underexpose the sunset and take many pictures and choose the best. I will try what you did too.

Thanks for sharing!!! I will have to try it one of these days!