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Definition of In black and white
1. Adverb. (idiomatic) explicitly, in writing, clearly and without doubt or misunderstanding, without any grey areas. ¹
2. Adverb. (literally) Using shades of grey/gray rather than colour/color. ¹
3. Adverb. Having it displayed using shades of gray/gray rather than colour/color (as it was shot or recorded). ¹
¹ Source: wiktionary.com