(as after drying)
Solid when pulling off the glued paper usually with printed layer of the leaves, and soft does not spoil the paper upon peeling (for example, when sealing the sheets in the envelopes at the edges with a perforation usually is applied to solid clay, and in the middle of a sheet of soft - otherwise, the barcode or the amount can portitsa at the opening and become unreadable...) - the soft not seen, but know that there is
For example - maybe(not always) to see soft in the accounts for gas, water... in the middle of the sheet.