A new source of natural anthocyanins dyes, from Liriope platyphylla fruit, is proposed. This paper analyzes the dye extracts, the primary color components of the extracts, the color features of the extracts under different pH conditions, and their application in silk dyeing. The research shows that, nine anthocyanins are found in？？L. platyphylla fruits by analyzing the results of the HPLC/DAD, MS, and MS/MS spectra. The five major anthocyanins related to delphinidin, petunidin, and malvidin derivatives take up 91.72% of total anthocyanin contents. The color of the solution is red under acidic condition (pH < 3.0) and stays in yellow under alkaline condition with pH values above 7.0. The dye extracts applied to silk fabric with mordant free dyeing show different color under different pH conditions, changing between purple, blue, green, and yellow. However, the dyed colors is light and the dyeing rate is low. Metal mordant such as Sn in chelation enhances the dye depth and improves the fastness of the dyed silk fabrics, especially in silk fabrics dyed by premordanting and metamordanting. 1. Introduction Natural dyes are generally environment friendly and have many advantages over synthetic dyes. In recent years, the applications of natural dyes are researched due to their biodegradability and higher compatibility with the environment [1–3]. Anthocyanins, with their common structure shown in Figure 1, are flavonoids commonly found in flower petals, fruits, and leaves and produce orange, red, violet, and blue colours [4, 5]. Earlier studies show that anthocyanins are especially abundant in bilberry, strawberry, raspberry, grape skin, blackberry, and so on [6–10]. Interests in these water-soluble pigments have been increased substantially during the last decade because of the increasing evidence demonstrating potential therapeutic effects. Researches also show that anthocyanins have strong oxidation resistance, inhibit the growth of cancerous cells, inhibit inflammation, and have antiobesity effects. The therapeutic properties of anthocyanins have been reviewed and proved [11–14]. Despite the great application potentials that anthocyanins represent for food, pharmaceutical, and cosmetic industries, their application in textile is limited as the pigments lack affinity for the fiber and cannot be sustained during washing and therefore requires further investigation. Figure 1: Structure of common anthocyanins. In general, anthocyanins show colour variation caused by pH or metal chelation changes. As natural dye used in textile, it is important to study the
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