Make notations of such tests, identifying the compound or equipment and commenting on the results of the test. Give tabulated test data, if available. Avoid unnecessary derogatory remarks about tests. Make corrections by drawing a single thin line through the entry. Do not erase or obliterate mistakes.
Photographs are useful in keeping a complete laboratory notebook.
Particularly when a model has been made, it is desirable to take photographs which will serve as future identification. Permanently paste the photographs into the lab notebook, giving the date, the identification, and the name of the photographer. Keep lab notebooks in a safe place when not in use. Keep lab notebooks relating to patent applications for at least 20 years. The term of most patent applications filed in recent years is 20 years.