We carry the key ring to the top of keys. Sometimes it's easy distinguish them, but other times that of the portal is exactly the same as the one at home and when we want to enter, we waste more time testing each other than we would really like. Today I propose a cheaper trick than approaching the nearest DIY store to get you a key covers to use
In the Italian blog Indie-guest we propose to cover the head of the key with a water balloon (of which in my time it cost a peseta, surely now they will not be more than 5 cents) and follow a color code to distinguish the key of each place. Once you have placed the water balloon on the faucet, make a hole to fit inside the key ring and you already have it.
The savings are interesting because the store covers do not usually lower the euro and a half or two euros. Also, if you combine the colors well, the place where you leave the keys while you are at home may be more colorful.