When you have a bunch of keys looking the same, getting the correct one to open a door becomes a guessing game.  Have different colour for each door is a good solution.  Silky keys combine design and functionality: color becomes part of the key head without changing its thickness.   Available for a wide range of articles in five different hues (green, dark blues, pink, red and orange).  We are bestowed with the natural ability to differentiate colours, why not put it to good use?