how to make walls(surfaces) black(after fire effect) when fire is passed through

dear all thanks for support.i have a scenario in which fire flame(particles) will be fired at the corner of the room ,here all the surfaces's texture which are touching the fire flame must turn black(into ash color or like after burn effect).also texture change must be dynamic such that if flames goes to some other area ,all the 3dobjects or the surfaces touching the flame must change their textures(after fire burn effect).how can i achieve this thing.help needed.thanks in advance.