After Cooler, Color : Depends On The Material Used

An aftercooler, commonly called an intercooler, is a heat exchanger used in a compressed air system. Its primary function is to condense and densify hot and humid compressed air, reducing its temperature and humidity before it enters machinery or downward movements. Role of aftercoolers in compressed air systems.
The compressed air produced by the compressed air can reach higher temperatures due to the compression process.
These high temperatures can hurt the compressed air quality and the downstream equipment's performance and longevity.