Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Akwai wasu ka'idoji da aka gabatar game da dalilin da yasa irin wannan fuka-fuki na waje ya kammala a grisaille.
Tabbas, mafi rikitarwa na jumla shine "Akwai dabaru da yawa da aka gabatar game da dalilin da ya sa aka kammala irin wannan fuka-fuki na waje a cikin grisaille, tare da mafi yawan abin da suka kasance a cikin zane-zane na al'ada na rufe hotunan addini tare da zane mai launin toka a lokacin lokacin kwanaki 46 na lokacin azumi wanda ya kai ga Easter. "