I hate clay tile for that reason. you can try some paint and it might last a while. Not much else you can do with that.
The transition should be done with translucent caulking for best results. Clear shows the stark contrast behind and white is too stark. Translucent gives a nice fade between the two surfaces. you can try going over it but its really not that hard to scrape it off and redo. Use a good firm plastic scraper and don't worry if it's not perfect, the caulking will bond. Just make sure it's clean and dry.
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