AH 1Z Viper Engine Color?

Trying to find what colors to use to paint the engines on the ( Kitty Hawk ) AH 1Z Viper . Per instructions they call for just plain Burnt Iron . Googled it but pretty much all pic’s are of the whole bird , not finding much as far as break down pic’s . Not real smart at this computer stuff .
Thanks for any help or guideance !

Google “T700-401C” it is the engine model by General Electric

Thank you !