To develop a practical teaching unit on dyeing for a one-credit senior high school home economics class, the standard conditions of dyeing practices reported in literature on teaching resources and dyeing studies were searched and the contents were analyzed. A dyeing experiment with the aim of utilizing waste onion skin, which has year-round availability, and a mordant with low environmental impact was developed. The onion skin needed to be extracted in advance. The dyestuff and mordant were prepared at 90-100℃ and room temperature, respectively, and were used at 100% and 6% o.w.f., respectively. Under optimal conditions, dyeing time was 20 minutes, including the time required to heat the dyestuff. Both dyeing and mordanting were done only once and created sufficient hyperchromic effect to dye the fabric. Post-mordant time was 10minutes, followed by a variable amount of time for the soaping process. The dyed fabrics were tested for washing and light fastness.