E Thompson Photography wrote:
One of many ways it can be done with the manipulating the blue channel during the conversion to b+w after retouching. You can use PS channel mixer, PS B+W filter or the blue filter in Silver Efex Pro 2. Those, of course, aren't the only ways but it could be a starting point. I'm sure you'll receive other suggestions. A;so be awarw that the lighting contributes to the final look also.

Thanks for your tip, Ill try those methods and see how it turns out.