Sunshine Yellow
This is one of the available colours listed by Diamine. I have not had the opportunity to use the ink. Given the colour difference between the web site colour swatch and my actual use for Yellow (see next colour) I would not necessarily go by the colour swatch.
Yellow
This is one of the special purpose inks that would be used for a note on a card. The colour is very delicate. Probably looks best on a coloured paper.
I tried it on an Easter Card but the card paper did not have enough of a colour distinction from white to give the ink a punch.
I found the ink to be much lighter in saturation and tone than the colour swatch on the Diamine web site.