Unfortunately not all bamboo cutting boards are created equal. Friend of mine had one (450mm x 300mm x 50mm) from some years back that was pretty worn and decided to resurface by running through the bandsaw taking about a couple of mm off. After doing this it felt pretty spongy and decided to investigate. He took the whole top layer off and the results are shown below. Not only did it contain lots of air but an assortment all kinds of timber offcuts little of which was bamboo.!
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