When my friend Simon worked in Belgium, he used a special black epoxy to coat the inside of a Petri dish so that he could more easily pick out cells. However, that black epoxy is extremely expensive, has a limited shelf life, and has to be shipped by surface mail from France. I volunteered to go to the MAC counter in Nordies to see if their Nocturnelle nail polish would be a suitable substitute for this epoxy. My verdict: several coats were required to attain a decent depth of blackness, and the nail polish was extremely soft and might not stand up to the rigors of pipette poking.
Naturally, Simon then came up with the brilliant idea of coating the outside of the dish rather than the inside, so he could use an inferior black epoxy that he already had. But I didn't go to the MAC counter in vain: Simon's daughter Isla was utterly captivated by my black lacquered pinky.
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