For you photoshoppers out there, the next time you make a black and white photo, play with the following adjustment. (Make sure your photo is 8bit) Layers> Variations. Set the fineness to the middle setting or lower and select midtones. The array of images given for you to choose have a small degree of color change. You choose the one you want and go from there.
The function was created to fix color casts before WB filters became amazing. Don't use it for that. Use it to impart emotion and subtle color to your BnW photos. It is amazing.