Primary Function: Ris Tsho Color Change yog ib daim ris tsho uas muab cov khoom siv paub tshee-tshee ntawm kev sov thiab txias los ua. Daim ntaub yuav hloov xim thaum nws ntsib cev sov, tshav ntuj los yog kev sov ntawm lwm tus neeg. Yog li ntawd, kev sib chwv ze zoo li ib qho puag yuav pom tau saum npoo ntawm daim ris tsho. Daim qauv raug txiav los ua kom pom cov kab txhaws ntawm daim ris tsho, thiab cov kab no muab kaw tau nrog daim npuas nplaum. Daim npuas nplaum tsis paub tshee-tshee raws li kev sov, yog li nws nyob ruaj nrees thaum daim ntaub nyob ib puag ncig hloov xim. Qhov sib txawv ntawm ob yam khoom siv no ua rau qhov hloov ntawm kev sov uas nkaum tseg pom tau yooj yim.