Extra-white glass. Size approx. 75 x 25 x 1.0 mm, ground edges 90°, SuperFrost® area white. - These slides are permanently positively charged. They are attracting electrostatically frozen tissue sections and cytology preparations, binding them to the slide. No additional special adhesions or protein coatings are necessary. Extra-white glass. Size approx. 75 x 25 x 1.0 mm, ground edges 90°, SuperFrost® area white. - These slides are permanently positively charged. They are attracting electrostatically frozen tissue sections and cytology preparations, binding them to the slide. No additional special adhesions or protein coatings are necessary.