Adverb

1. explicitly, in writing, clearly and without doubt or misunderstanding, without any grey areas.

   I'll believe that when I see it in black and white.

2. Using shades of grey/gray rather than colour/color.

   This film was shot in black and white.

3. Having it displayed using shades of gray/gray rather than colour/color (as it was shot or recorded).

   to watch color films in black and white