Logo Colors

You've had your logo designed and it looks great.  You decide to order custom embroidered polo shirts but before  placing your order you realise that you forgot to consider possible shirt colors when having your logo designed.  You know white shirts will work but you'd prefer a darker color. You really want black shirts but black is a color in your logo.  Can the black in your logo be changed to white so you can choose black shirts? The easy answer is "Yes" but there are issues to consider.