elementResinElements · Colors & materialsTree gum hardened for incense, varnish, and seal. Not frankincense as a named Boswellia, and not pitch.Resin is used in Medicine.Dioscorides’ De Materia Medica lists tree resins among incense-adjacent and medicinal gums. First-century pharmacological use of soft resin, not frankincense as a named gum already walked and not pitch as the cooked dark form.from Pedanius Dioscorides · De Materia Medica, 1st century CEused in · sourced · documentedsourcesDe Materia Medica · Pedanius DioscoridesDioscorides, De Materia Medica.