The black parts may be the refracting of the black areas in your scene. Btw, that is a SWEET render/jar you have there! Also, looks great because you also have an outside AND an inside to your jar. Most just take a "bottle" and put a glass mat on it. That will look strange, because there is no "inside"; it is literally just a solid piece of glass. Yeah, it is misnamed HDRI. When I was first creating pictures using it I called it a global image (taken from global lighting). Never caught on, lol. AgentSmith

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