I recently went to Thailand, during my travels they stamped my boarding pass with blue ink and put it back in my passport. I didn’t notice then, but when I came home I realised there are blue ink stains on the 2nd page of my passport opposite my data page with my photo and information which is in good condition. The ink stains don’t block anything about my data - signature and photo is still visible. The ink stains covers some writing about aboit the OBSERVATIONS elements of the passport. I’m wondering if these blue ink stains would cause any issues when I decide to travel again back to Thailand.