Abstract：
Dyes/colorants are normally used to improve the aesthetic of consumer products, and leather is one of them. The leather industry plays a significant role in the global economy. However, the leather-making process causes severe environmental pollution. Synthetic dyes are one of the major classes of leather chemicals that are responsible for the enhanced pollution load created by the industry. Over the years, excessive use of synthetic dyes in consumer products created severe environmental pollution and health hazard. Many of these synthetic dyes are carcinogenic, allergic, cause serious health problems for human beings, and have been restricted by regulatory authorities for use in consumer goods. Since ancient days, natural dyes and colorants have been used to make lives colorful. Amid the green movements and environment-friendly products/processes, natural dyes are back to mainstream fashion. Moreover, natural colorants have become a trend due to their eco-friendly nature. The demand for non-toxic and eco-friendly dyes and pigments is increasing. However, the question remains \"is natural dyeing sustainable\" or \"how to make it sustainable.\" Here, we review the literature reports on natural dye\'s application in leather in the last two decades. This review article provides a detailed overview and current knowledge base on the various plant-based natural dyes used in leather dyeing, their fastness properties, and the need of the hour in terms of product and process development to make natural dying sustainable. The color fastness characteristics of the dyed leather to light, rub, and perspiration have been critically discussed.
摘要：
染料/着色剂通常用于改善消费品的美感，皮革就是其中之一。皮革行业在全球经济中发挥着重要作用。然而,制革过程造成严重的环境污染。合成染料是皮革化学品的主要类别之一，是造成工业污染负荷增加的原因。多年来,在消费品中过度使用合成染料会造成严重的环境污染和健康危害。这些合成染料中有许多是致癌的，过敏,给人类带来严重的健康问题，并受到监管机构限制用于消费品。自古以来，天然染料和着色剂已被用来使生活丰富多彩。在绿色运动和环保产品/流程中，天然染料回归主流时尚。此外，天然着色剂由于其环保性质而成为一种趋势。对无毒和环保的染料和颜料的需求正在增加。然而,问题仍然是“天然染色是否可持续”或“如何使其可持续”。\"这里,我们回顾了近二十年来有关天然染料在皮革中应用的文献报道。这篇综述文章对皮革染色中使用的各种植物基天然染料进行了详细的概述和当前的知识库，它们的牢度特性，以及在产品和工艺开发方面需要时间，以使自然死亡可持续。染色皮革的耐光色牢度特性，rub,和汗水已经得到了严格的讨论。
