Round Cake Pan

Our cake pans are pure food grade aluminum, we do not add any artificial coating or treat our products with sulfuric acid (anodizing). Because of this any imperfections in the metal we receive are evident in the final product. Unlike our competitors, who cannot hide these marks under nonstick coatings or can be chemically burned off through anodizing.
This is the aluminum hardening on the surface, the colour can effectively alter or change depending on the hardness of the water, and other factors. This is a natural process known as seasoning. This discolouration can be removed with vinegar or lemon juice, the discolouration does not impact the performance of the pans.
These black streaks occur when the cake pan is spun during the manufacturing process. It is a natural occurrence in the material. We are proud to use 100% pure organic aluminum without any additives. This discolouration can be removed with vinegar or lemon juice, the discolouration does not impact the performance of the pans.
The inside diameter of the 9" cake pan is roughly 8.75 - 8.85 inches.
We do not anodize our products. It is pure natural aluminum without any additives.
It is likely some residual carbon from the manufacturing process. It is completely harmless and can be removed with vinegar or lemon juice.
Our 9"x3" pan should just about fit, according to the dimensions on the instapot website which say the inner dimensions are 10.39 x 6.89 inches.
The optimum baking temperature is about 400 degrees. The pan, however, can withstand up to 1000° F.
We recommend a piece of parchment in the bottom and greased the sides well.
We would recommend a 9" pan for the 8.5" diameter parchment.