Black fusible interlining, showing the blue fluorescent iron-on glue drops. Iron-on interlinings are used to stabilize all kind of fabrics. Due to the illumination combination, the lower part of the tissue has white halos from the darkfield illumination, while the upper part responds in black from incident illumination. Microscopic contrast method: transmitted darkfield in combination with incident brightfield and UV excitation incident fluorescence. Magnification 90x when printed at 10 centimetres width.