Wiktionary
alt. To colourise; to add colours to a black-and-white drawing, using coloured drawing equipment. vb. To colourise; to add colours to a black-and-white drawing, using coloured drawing equipment.
WordNet
Usage examples of "colour in".
She felt the colour in her face again and was glad that at that moment the dog left Hadstock's side and walked towards her.
She was dressed in a shimmering frock of silver lace, there was a tinge of colour in her face, and she smiled at him joyously.
The little coral beads which surmounted them seemed to me to have more colour in them than they would have shown had death really taken possession of this elegant form.
The colour in her cheeks, present when she laughed, or when tweaked by the cold wind while they were riding to her estates, was gone, replaced by a near-parchment pallor that could not be mistaken for anything other than what it was.
At that time he must have been sixty-seven or eight and yet there was still colour in the long hair and carefully trimmed beard.
She sat very upright and there was a spot of colour in each cheek.
They talked with their heads, which changed colour in different ways to mean different things.