I remember the initial reaction was that the in-hand pics showed a really weird orange paint finish, which really drove people away from purchasing this piece. I haven't seen any weird orange Thing PF ever since, so it was probably just an isolated issue or perhaps problem with the camera itself. My thing PF have the correct color, as do any Thing PF you see in people's collection.
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Just sold my Thing a few weeks ago after having ordered it from Sideshow several years back.
One of the deciding factors was the orange discoloration it had on the inside of his arms and underneath his neck to mid torso. It is a very real issue. Whether it's a defect or not is entirely dependent on the purchaser.
Despite my space limitations and his orange discoloration I still would have kept him had he been solid like the Hulk PF.
It was an excellent sculpt and you can't go wrong should you decide to purchase him.