Dyes extracted from annatto (Bixa Orellana L) seeds are being used in this study. The plant is from tropical region and represents 70% of all the natural dyes produced in the world and 90% in Brazil. The present work describes the method used for extraction of the dyes from the seeds and it's characterization. Also the method of KOH was used to determine the bixin content of the extracted dye. Ethyl alcohol was used as the extracting agent as well as the facility to recover it through distillation and reuse of the same thus, keeping the costs minimum. The extracted dye was in the form of powder and the concentration was seven times stronger than bixin (main dye component) with 4 times in quantity in comparison to other available methods. The dye was then used to dye cellulosic fiber by exhaustion method. Dyeing was carried out using mordents through pre and post mordent dyeing in order to compare the fastness properties of the dye. Reflectance curves of the dyed materials were made using Gretag McBeth Colour Eye 7000A spectrophotometer.
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机译：在本研究中使用了从annatto（bixa Orellana l）种子中提取的染料。该植物来自热带地区，占世界各地所有天然染料的70％，在巴西90％。本作者描述了用于从种子中提取染料的方法及其表征。此外，KOH的方法用于确定提取的染料的苄醛含量。使用乙醇作为萃取剂以及通过蒸馏回收和再利用的设施，因此保持成本最小。萃取的染料以粉末的形式，与其他可用方法相比，浓度比哌嗪（主染料组分）强的七倍，其数量为4倍。然后通过耗尽方法使用染料染色纤维素纤维。通过前后染色和柱状染色，使用染色进行染色，以比较染料的牢度性能。使用Greetag Mcbeth Color Eye 7000A分光光度计进行染色材料的反射曲线。
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