|Stock 370cc injectors (and Nismo 555cc) injectors are purple when new.
With time and heat cycles they discolor and fade to that grey / tan color.
Replacing 1 dead injector vs. all six wasn't really all that uncommon in the early 2000s.
President of Z-Car Club of Northern Virginia
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red
2006 Nissan Frontier SE in Ultra Black