Filing System for Chemicals : You need to be aware of which chemicals are in use, where they are being used and where they are kept. However, you might hesitate to make it too easy for other people to find them. If you have reagents and other solutions in the lab, these can be said to be "filed" if they are arranged in a specific order. (It is easier to see if any bottles are missing if you have a set sequence in which they are arranged). There are several ways in which solutions can be arranged, e.g. alphabetical order, sets for particular experiments (such as staining slides or food tests), in order of oxidizing power (for bench acids), in order of strength (for bench alkalis), etc.
If you use plastic embossing tape for "permanent" labels, you have the opportunity to incorporate a system of colour-coding.