As with Aristotle, Galileo, Copernicus, Curie, and so on, their novel contributions have been told from one writer to the next over so many generations that one needs to read the originals to find out what they actually said. Alan Turing's reaction-diffusion instability of 1952 was an immediate hit with theorists. By this time it had already started getting Citations , and these continued doubling very 9 years up to the current 100 per year.
Bumps fade back into uniformity when conditions are made non-permissive.
The only technicality left unchecked, that could finish confirming this as an example of Turing's mechanism, is that when the diffusion coefficients become equal, pattern should not spontaneously arise. No one doubts this, so far as I know, so chemistry now has its long-sought example. I think there is still no confirmed biological example. He showed that the uniform state can be unstable to infinitesimal perturbations. Then spatial inhomogeneity can arise spontaneously from prior uniformity, needing no finite kick .