本研究之目的是提供美髮從業人員對天然染髮劑添加何首烏粉或咖啡粉助染劑時的流程認知。更想藉由實驗證明出最佳的顏色明亮度和彩度，並實驗有無蒸氣受熱下，頭髮的顏色明亮度與彩度之變化。研究方法是利用分光測色儀，測試染髮添加何首烏粉或咖啡粉當助染劑時後之明亮度，並分別探討在室溫與蒸氣之下，以不同的水溫、不同停置過色的時間之顯色效果。髮片實驗結果分析顯示：天然指甲花染髮添加何首烏助染時顏色較為飽和，而使用咖啡當助劑，色素明顯著色力不高，色彩飽和度亦較低。由實驗可得知天然指甲花粉不亞於化學染劑，所染出來的顏色具自然色調。染髮在未來已成為日常生活中不可缺乏的一環，希望可以提供學術和業界及對此領域有興趣的相關人士，共同參考指教，要如何使消費者安心又健康的染髮，更為本研究最終的期待與目標。

The purpose of this study is to provide an instruction of adding Polygonum
multiflorum and coffee power to the natural hair dye, find the best colorfulness and brightness through experiment, and test the difference in hair color and brightness with or without steam. The spectral colorimeter was used to test the hair brightness after adding the Polygonum multiflorum or coffee power to the hair dye and discuss the color effect with the variation of water temperature and dyeing duration under room temperature and steam. The result of the hair experiment showed that the color of the natural Henna powder is more saturated
with Polygonum multiflorum and the pigment is more apparent with less color saturation when adding coffee powder. Based on the experiment, it is found that the Henna hair dye can give hair a more natural color than chemical hair dye.Since the hair dyeing has been taking a part of people’s daily life, it is hoped that the results of this research can be taken as references for people who are interested in this field. The ultimate goal of this research is to help people safely and healthy
dyeing their hair.