Hello ballarddog and welcome to the ArtRage forums 
While ArtRage is not designed as a photo editing tool it could be used for colouring B&W images.
The colours would need to be on their own layers above the original image and have their 'Layer Blend Mode' set to ‘Colour’.
As ArtRage’s primary focus is the creation of original paintings, it uses canvas textures which interact with the paint being used to replicate the looks of real world media. So you might want to consider setting your canvas and layers to a very smooth paper texture or 0% to preserve the textural look of the original image.
If you want to experiment first, you could try the demo version of AR6 to see if it is suitable for your needs here: https://www.artrage.com/demos/
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ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.14.6 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M