求翻译：(1)素色：练漂后的布放进染缸里加人染料，在一定酸碱度下经过一系列染色工艺使染料着色在布上，即为素色布。是什么意思？

(1) plain: after scouring and bleaching of cloth to put people into the dye VAT dyes, under certain pH value after a series of dye dyeing the cloth, that is, as plain cloth.