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What makes alkali metal halides sometime...

What makes alkali metal halides sometimes coloured which are othersise colourless ?

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It happens because of metal excess defects on accound of anion vacancies that are filled by electrons.
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DINESH PUBLICATION-SOLID STATE-QUESTION FROM BOARD EXAMINATION
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  11. How many atoms are present in a cubic unit cell having one atom at eac...

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  13. What is the number of atoms per unit cell in a body centred cubic stru...

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  20. Why Frenkel defects are not found in pure alkali metal halides?

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