| prov:value
| - Preferably, the multilayer curtain of step a) comprises at least one layer comprising at least one pigment such as clay, kaolin, calcined clay, talc, calcium carbonate, titanium dioxide, satin white, synthetic magadiite, hollow or solid synthetic polymer pigment, zinc oxide, barium sulfate, gypsum, silica, alumina trihydrate, mica, and diatomaceous earth.
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