What color are the grommets?
The grommets are silver.
How well do they block out light?
They can block at 85%-99% light. Kindly note that it depends on the color you choose. Darkers are more better in darkening.
Is the mention 52 X 84 Inch measured in one panel or a pair?
The mention 52 X 84 Inch means each panel is wide 52in and length 84in.
Do they have a strong dye or chemical smell?
No, these microfiber blackout fabric are confortable and produce with high quality material, will not have bad smell.
Will this help reduce outside noise and keep room cool if it is hot outside?
Yes. Made of 230GSM high quality polyester fabric,it is thick enough to reduce outside noise and thermal insulated.