I consider hole and crack patching an art form. You have to be very skilled and have a good eye to match terrazzo correctly. First you have to get the colors right, I use real terrazzo in every hole, and you have to find every hole which is not easy if there is a lot of holes everywhere.
If have to be skilled in grinding down the patches if you are not you can damage the terrazzo, this is very true when the whole is large. The larger the hole the harder and more skill needed. This is probably the reason I get ost of the floor with very large hole repairs I don't think anyone else knows how to patch certain holes.
below are examples of my patch work.
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