Medium silver is being offered by Indus motors since 2002, initialy this color was only being offered in Se-Saloons. The major point of this color being sooper dooper common is that this color was offered in Gli after the launch of 10th Gen.
The color code can be different between 9th Gen and 10th Gen Corollas but the color is there since along time now.
before you say me wrong, My mamus 2010 GLi that got stolen, My 2011 Jan Gli, My uncles 2002 Corolla SE-Saloon are all Medium silvers.