Laka mai aiki wani abu ne mai shaƙar ruwa da aka yi da yumbu (galibi bentonite) a matsayin ɗanyen abu, wanda aka yi masa magani da sinadarin acidification na inorganic, gishiri ko wasu hanyoyi, sannan a wanke a busar da shi da ruwa. Yana da kamannin farin foda mai madara, ba shi da ƙamshi, ba shi da wari, ba shi da guba, kuma yana da ƙarfin shaƙar ruwa. Yana iya shaƙar abubuwa masu launi da na halitta. Yana da sauƙin shaƙar danshi a cikin iska, kuma sanya shi na dogon lokaci zai rage aikin shaƙar ruwa. Lokacin amfani da shi, ana ba da shawarar a dumama (zai fi kyau a digiri 80-100 Celsius) don farfaɗowa. Duk da haka, dumama sama da digiri 300 Celsius yana fara rasa ruwan lu'ulu'u, yana haifar da canje-canje a tsarin kuma yana shafar tasirin shuɗewa. Laka mai aiki ba ya narkewa a cikin ruwa, abubuwan narkewa na halitta, da mai daban-daban, kusan yana narkewa gaba ɗaya a cikin soda mai zafi da hydrochloric acid, tare da yawan 2.3-2.5, da ƙarancin kumburi a cikin ruwa da mai.

Farin yumɓun da ke faruwa a zahiri wanda ke da kaddarorin yin bleaching na ciki shine fari, fari, yumɓun toka wanda galibi ya ƙunshi montmorillonite, albite, da quartz, kuma nau'in bentonite ne.

Galibi samfurin ruɓewar duwatsu masu kama da dutse mai aman wuta, waɗanda ba sa faɗaɗa bayan sun sha ruwa, da kuma ƙimar pH na dakatarwar ya bambanta da na alkaline bentonite; Aikin bleaching ɗinsa ya fi muni fiye da na yumbu mai aiki. Launuka gabaɗaya sun haɗa da rawaya mai haske, fari kore, launin toka, launin zaitun, launin ruwan kasa, farin madara, ja peach, shuɗi, da sauransu. Akwai fararen fari kaɗan. Yawansu 2.7-2.9g/cm. Yawan da ake gani sau da yawa yana da ƙasa saboda porosity ɗinsa. Haɗin sinadarai yana kama da na yumbu na yau da kullun, tare da manyan abubuwan sinadarai sune aluminum oxide, silicon dioxide, ruwa, da ƙaramin adadin ƙarfe, magnesium, calcium, da sauransu. Babu plasticity, tare da babban ƙarfin sha. Saboda yawan sinadarin hydrous silicic acid, yana da acidic zuwa litmus. Ruwa yana da saurin fashewa kuma yana da yawan ruwa. Gabaɗaya, mafi ƙarancin laushi, mafi girman ƙarfin canza launi.

Lokacin gudanar da kimanta inganci a lokacin binciken, ya zama dole a auna aikin bleaching ɗinsa, acidity, aikin tacewa, shan mai, da sauran abubuwa.