If it is a standard racing/TB Wetherbys one then they are different colours for each year of foaling, my TB has a dirty brown coloured as he was foaled in 1991. Not sure if that is the same for the non-racing ones though! Hope that helps
The latest version of red is for 6 year olds. Europe hold to the same colour coding for each year. The American's like to be different and all of theirs are blue back and clear fronted.
1995 is Blue. 1996 is Grey. 1997 is Purple. 1998 & 1999 can't remember off the top of my head. . 2000 is Gold. 2001 is Turquoise. 2002 is Mushroomy backed, clear front. 2003 is Gold backed, clear front. 2004 is Green back, clear front. 2005 is Red front, clear back, 2006 is Blue back, clear front. 2007 is White back, clear front. 2008 is Brown back, clear front. 2009 is Yellow back, clear front.
French passports are the same colour but are that colour all over with a window on the front for the horses name and number.