Unfortunatly i dont think it was erick. I found this picture on a website that was dedicated to an artist from around this time, id love it though if there was a photo version of this picture and it would be even better if it was colour, then the mystery of the Queens sitting room and the way its decorated would come to and end.
My own wild guess however after studying the photograph of this room from around 1914 is that the damask is a bluey purple, i have no idea why its just what comes into my head lol.