I bought some Revelll mahogany at Ace hardware and started to experiment with it and though I eventually managed an engrave with 7 passes at 50 power and 1000 zoom the grain stood out a lot but it did not turn to charcoal as it did when treated to basswood settings.
Compared to other mahogany I have used years ago this is nowhere near as dense and that may be a part of the problem but it occurred to me to warn others and seek out information others might have about such surprises.
Another thing I found as I was thinking for a long while but not had a chance to test. If you get the mahogany very wet it reduces the charing for the most part but only reduces the effect of the laser a little. More importantly the smoke is less likely to flame up as the mahogany seems to do more than any other wood I have used.