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Contact SupplierThis isThe BLUE Test Inks are special testing liquids in ranges of defined surface tension (from 30 to 72mN/m in The surface tension of a substrate is checked by simply applying the test ink to the surface. The BLUE Test Inks are available in a range from 18.4 to 105 mN/m. Available in bottles or in pen form (28 to 72 mN/m). Toxic from 24 to 57 mN/m.