This once was a black and white photo! Really! Look what post production playing produced . . .
Below is the original black and white image, shot on Ilford FP4+ with an orange filter – an Orange 21 specifically – using an Olympus OM-1n and 50mm f3.5 macro lens.
This was the first pass with a preset I made in On1 Photo Raw 2019.
I added the same preset to the above a second time and got the very first one you see at the top.
I am not sure if I can replicate it, but plan on trying.
Meanwhile, I need to read a lot more about orange filters – some of the images came out ok, some great, and a lot were just worthless.