Dragon Ball Z: When Did Goku Officially Reach Super Saiyan 2?

I made this image to how different Vegeta's hair can look between SS1 & 2 : r/dbz

A Promise Made to Kakarot Super Saiyan 2 Vegeta (Angel)

Was Vegeta always in SSJ2 form during the Buu Saga or did he only become one during this exact moment? Didn't notice any changes to his hair throughout, that's why I'm confused.

How Would YOU Have Designed Goku & Vegeta's Super Saiyan 2 Forms

Goku Vegeta ssj1 ssj2 god blue by Saladto on DeviantArt

Dragon Ball Theory: Why we were wrong about the Grades. Vegeta and

Should SSJ, SSJ2 and SSJ3 be in Super Anymore?

dragon ball series - Was Vegito SSJ1 or SSJ2 when fighting Buu

Vegeta GT SSJ1-SSJ2-SSJ3-SSJ4-SSJ5-SSG-SSB-SSBE by

Alguien puede mostrarme las diferencias entre Vegeta SSJ1 y SSJ2