Occupational dermatitis from colophony

Occupational allergic contact dermatitis from ethylhexylzinc dithiophosphate and fatty acid polydiethanolamide in cutting fluids

“…Our patient’s patch test reaction to colophonium may also have resulted from previous occupational exposure (11–13), even though it was not present in the 2 cutting fluids analyzed.…”

Bullous dermatitis caused by common juniper

“…Several cases have been reported in the literature in which concomitant (delayed) contact sensitivity is observed to colophonium and to a Juniperus species/cultivar or another member of the Cupressaceae family (eg, × Cupressocyparis leylandii ) 3‐6 . However, the reaction described here had the characteristics of an irritant rather than an allergic aetiology.…”

“…2 Several cases have been reported in the literature in which concomitant (delayed) contact sensitivity is observed to colophonium and to a Juniperus species/cultivar or another member of the Cupressaceae family (eg, × Cupressocyparis leylandii). [3][4][5][6] However, the reaction been recognized that Juniperus species can be a source of these substances, 9 and these well-known irritants have been reported from J. communis. 10,11 These lignans appear to be secondary metabolites produced by endophytic fungi 12,13 that colonize the roots when the plant is stressed, so the levels of these lignans are likely to vary.…”

Colophony: Rosin in Unmodified and Modified Form

“…Rosin components in metalworking fluids are a common cause of ACD which has been reported throughout the years (Fregert 1979;Matos et al 1988;Grattan et al 1989). Recent publications demonstrate that rosin from metalworking fluids still causes contact allergy in the machinists using them (Geier et al 2004;Suuronen et al 2007).…”