Photographed by Ramona Jingru Wang. Welcome to  Sun Blocked , Refinery29’s global call to action to wake up to the serious dangers of tanning. No lectures or shaming, we promise. Instead, our goal is to arm you with the facts you need to protect your skin to the best of your ability, because there’s no such thing as safe sun.  I watch, transfixed, as a cosmetic scientist proves that a sunscreen claiming to contain SPF 45 might actually have, if you can believe it, an SPF of 3.6. Not SPF 30 — not even SPF 15 — but SPF 3.6.  Posted on TikTok by Dr. Julian Sass , the video shows the staggering process he goes through to uncover that the sunscreen in question could contain almost no protection from ultraviolet damage . Dr. Sass shows the full extent of the alleged fraud: Firstly, a suspiciously transparent consistency. Secondly, the ingredients list, which is missing many of the usual ingredients that typically constitute mineral sunscreen, like zinc oxide, for example.…