it is very pretty hope you can remove the spot Grandmas spot remover will remove it .also soke it in oxy clean it takes most any thing out.
Lenamae
It depends on how much moisture is in the air on how fast the mark goes away. On rainy damp days I had it disapear in minutes.
Looks really nice and until you pointed out the spot I didn't even notice it. Here is a recipe for removing the marker. Make up a small amount of water with a dash of alcohol and a drop of clear dish soap. The soap helps to penetrate the ink and the alcohol wipes out evidence of the blue or purple marker. If you have a q-tip to use that would allow you to dab just that spot. I do hope you have not used the dryer or the iron as that could have set the sport permanently.
I have had this same problem & in the end I used a tide stick. Good luck