This question already has an answer here:

I've tried placing tainted blocks, fibrous taint, all of it. What do I do?

marked as duplicate by Wrigglenite, Lore Friendly, Schism, John the Green, angussidney Mar 10 '18 at 23:53

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You cannot "start" taint by placing taint blocks - you must change the biome type to a taint biome.

The only way to achieve this is using "Bottled Taint"

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