colour code tools with nail varnish
I use nail varnish to colour code tools to power tools eg all of the tools associated with adjusting the height of my planner knifes are colour coded with blue nail varnish
I find colour coding allen keys very useful
I also apply the same principle to keys eg All of the front door keys to the house for each family member have a red spot on
This allows simple matching of key to lock and reduces wear on lock by he eliminating errors of trying to open doors with an inappropriate key
External porch keys are marked with white nail varnish which is easier to see in the dark
In some situations to aid memory a spot of varnish on the lock and key allows matching of key to lock
I used the nail varnish tip when working as a manager of a pharmcay store to grade keys
eg All external door keys green nail varnish, all till keys red nail varnish , controlled drug cabinet fluorescent pink nail varnish
Applying this principle is useful if undertaking a staff security search You have a simple visual indicator if staff have in their possession any shop keys