Blue - kitchen and office
Green - bathroom and cleaning
Color-coded moving box labels work best when the whole house uses the same small legend. Four or five colors are enough for most homes and easier to remember than a rainbow nobody follows.
Assign one color to one room family, then keep it everywhere: the label sheet, the tape stripe, and the inventory line. That is what lets helpers unload without asking where every box belongs.
Color alone is not enough for storage, donation, basement overflow, or split bedrooms. Add plain text labels when a box might be unloaded into the wrong corner even with the right color.