I am very happy with the pattern and the weight of the cutlery but I am concerned with some dark discolouration on half of the knives.  Do you know what this might be?  I haven't tried cleaning anything yet but the marks do not appear to go away when buffed with a soft cloth.  My picture shows the dark colouring on the 4 knives on the right of the picture.  Please let me know if you think I should try to put in the dishwasher. Thanks.