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Hi,

would you mind hanging-on to this sheet of paper, and re-photographing it in, say, a month?

My experience of Quink ‘Blue/black’ is that it changes from that attractive dark blue-black colour to a rather odd shade of teal.
This change usually occurs within a month. The change happens more-rapidly on some papers than on others. I think that the ink reacts with sulphites in the paper.

 

The final teal colour is not an unpleasant one (if one likes teal), but it’s certainly not the colour that I expected when I bought the ink! 😁

Already filed @Mercian will add to gallery again if I remember 

@Mercian yep it went teal as has my waterman mysterious blue