Then paint the middle section of the two sets two different colors. Helps keep metric and inch tools sorted correctly. ( e.g. After fiddling for several minutes trying EVERY METRIC tool, you finally discover that the needed metric tool was mixed in with the inch sized ones.) @#$R%^&* (expletive edited)
Those small bottles of touch up paint for trucks are great for color coding tools. Not too expensive, brush built into the cap store in the paint, no brush to clean up ...
In shop I keep a few colors, from the resistor color code, Red - Orange - Yellow - Green - White.