[antir-heralds] Device question - books

[Lianor de Najera]

Is there any way to have a brown book in a device?  While there are 
examples of 'books proper' being registered, they're all early, and I'm 
seeing things since that imply there is no proper colouration for a 
book.  As far as I know, that'd be the only way to have a brown book, 
wouldn't it?  Or is there something I'm missing?

-- 
En Servicio,
Lianor de Najera