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When it comes to the latest and greatest in hair colour, we leave nosalon unturned. We've reported on everything from niche colour trends made for the brave to universally-flattering tones on the verge of becoming huge. But for every enviable, can't-look-away, after-hair-colour shot, it's easy to forget what existed before that big appointment. And it's not always pretty.Last week, we talked a lot about colour correction , a term that might send shivers down your spin if you've ever had a botched colour job. (Or, let's be honest, if you've ever given yourself a botched colour job.) Suffice to say, colour correction is expensive, sometimes very time-consuming, and even a bit scary — but what the best colourists can do to transform hair from eeek to oooh is also downright amazing.Naturally, the most jaw-dropping looks can be found on Instagram — the app that's proven to be the hairstylist's most important portfolio — and the place to show off before-and-after split screens of their most advanced work. To prove that no job is too large, no regrowth too long, no blond too brassy, we've rounded up a few of the most noteworthy transformations coming from L.A.'s top colourists.Ahead, 25 before-and-afters that will blow your mind — and the must-follow accounts for continued inspiration.