If you want to grind off the glue on the string of hands, you can only slowly grind down the glue on the string of hands with fine sandpaper, but this operation can easily damage the bead itself, so it's best to send it to a professional hand for polishing. We can tell whether a bead has been glued with a purple light.
The bracelet was originally a kind of Buddha beads. It is usually made of wood beads, and then perforated and strung with rope. The bracelet made of 18 beads is more common. But now there are also some hand strings that put a layer of glue on the beads in order to beautify the appearance and prevent cracking.
Usually, if you want to grind off the glue on the hand string, you can only slowly grind down the glue on the hand string with fine sandpaper, but this operation can easily damage the bead itself, so if you want to grind off the glue on the bead, you'd better send it to a professional hand for polishing.
In fact, we can try to avoid the beads that have been glued when buying the bracelet. We can distinguish them with the help of the purple light. As long as the purple light is used to illuminate the beads, if there is green light or fluorescence at the texture of the beads, it means that they have been glued.