In order to get the Notre Dame restoration elements correct, no effort has been spared in locating the correct materials. In order to stabilize and restore the vault, experts must identify limestone with identical properties as the centuries-old blocks already intricately locked in place.
Geologist Lise Leroux studied the stone to find its origin, leading her to quarries beneath Paris, now commonly known as the Catacombs, where she has been able to match micro-fossils found there with the samples from the vaulting stones in the cathedral.
https://www.lonelyplanet.com/articles/notre-dame-cathedral-five-facts
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This is going to seem a preposterous, but I have been wondering since I watched the cathedral burning on TV with millions of others, how many people will be needed to rebuild and restore Notre Dame and especially, is there any way I might be able to contribute by artistic skills to that project? Who would I contact to submit a CV and portfolio? Or do I just show up one day at the security gate with a dust puffer thingy, camels’ hair brushes, and safety glasses in hand?