chobi wrote:
Is there any way to find out the colors from black&white photo such this?
There is no certain way of establishing colours from a black and white image.
The two photographic systems touched on above are panchromatic and orthochromatic. (Ortho or Pan for short - look 'em up for more.) Knowing which is which gives you an idea, as in Mgawa's illustration as to which tone a colour might have headed to, but if you don't even know if the colour is, say yellow or red in the first place, you're stuck (the woman's hat, given as red, could have been dark brown or beige for instance...) The intensity, depth or makeup of a colour will shift it from an absolute value as well.
If you have a good 'test card' sample in an image of a known colour (roundels, national markings, standard symbols, flags etc. can be useful for that) you can estimate other greys of the same value may well be the same - but it's far from certain.
Sorry, but anyone telling you a colour is X from a b&w without additional information or the analysis above is selling you snake oil.
HTH