While viewing an early evening sky with a mix of sun and cloud, that is the nice little puff ball bits of cloud one sees on a fair evening, one notices that the bits of cloud are backlit by the sun as it is beginning to sink and are wonderfully yellow at their fringes, with maybe a deepening grey in their centres, especially the larger bits, all glowing against the clear blue of the sky. I love this look and have been trying to capture it. The problem is, of course, that as I create a soft yellow smudge to suggest a bit of backlit cloud, it creates a green where the cloud’s soft yellow edge meets the blue wash of the sky. That green transition is of course not seen in reality. How to recreate it without the green?

Another related challenge is a blue sky fading to yellow as it approaches the horizon, again without any green that I can see.

I suppose what I’m asking is how to create a variegated wash going from yellow to blue without an intervening green?