Embassy legalization for use in Thailand
A Thai office has no way of telling whether a signature on an Italian record is genuine. The chain solves that in two moves. An Italian authority vouches for the signature; the Thai mission in Italy then vouches for that Italian authority. A paper carries weight abroad only once both of those marks are on it, and neither one alone is enough.
What the Thai consulate looks for
The consular desk begins with the Italian mark, not with the story behind the paper. It expects an original or a certified copy, a clean and legible Italian stamp, and its fee. Document legalization for Thailand fails most often over presentation: a smudged seal, a page left out of the set, or a name written one way here and another way there.
The Verona → Thailand route step by step
Take the record through in the order the chain demands. Notarize it if it is private, then carry it to the Prefettura (Prefecture) or, for court and notarial papers, to the Procura della Repubblica. Buy the tax stamp where the record calls for it. Present the finished file at the Thai mission in Italy as the final move, never earlier.
Cost and timing for this corridor
Budget for two things at once. Money: a fixed Italian tax stamp of €16 on each paper, plus an official consular fee set by the Thai side. Time: 10–15 business days for the standard chain and 3–5 business days on the express track. Of the two stages, the consular one is the harder to schedule, so give it room.