Impande eyomisiwe negqotshiwe yesitshalo se-madder (Rubia tinctorum), umthombo obaluleke kunayo yonke wombala obomvu ngaphambi kwesikhathi semibala eyenziwayo. Iqukethe i-alizarin ne-purpurin — imibala ye-anthraquinone ebophela emicwini ezilungiswe nge-alum futhi enikeza umbala obomvu ongaphumi ekuwasheni. Ubomvu obujule kakhulu buvela ezimpandeni ezineminyaka emithathu noma ngaphezulu.