“…[4][5][6] Sensitization to ingredients of water-based MWF, like emulsifiers, preservatives, tall oil constituents, anti-corrosion additives and additives that prevent foaming is common. 7,8 The development of new high-performance coolants leads to the exposure of metal workers to new allergens, such as TMPPOPT, which are not included in the routine patch test series. Therefore, patch testing of patients' own products and their ingredients is essential to identify new allergens.…”