6.4. Lay two sheets of filter paper (5.5) (about 500 × 500 mm) on top of each other on a smooth surface; fold the four edges of both filter papers upwards to a width of about 40 mm to prevent the prills from rolling away.
6.4. Poser deux feuilles de papier-filtre (5.5.) d'environ 500 × 500 mm l'une sur l'autre sur une surface lisse.