5. Do not give handkerchiefs as gifts to your friends or loved ones,
because the relationship between you and your friends or loved ones will end in tears.
6. Do not wear black when visiting people in the hospital.
Ancient Thai people consider black as the colour of pain and sadness used for mourning, and so must not be worn on festive occasions, especially when visiting friends or family in the hospital. The custom of not wearing black to visit sick people in the hospital is still considered hospital etiquette today.