Tujuan dari penelitian ini adalah diperoleh suatu metode standarisasi warna yaitu penilaian secara konsisten terhadap warna yang dibentuk oleh pewarna alami secang, sehingga dapat dijadikan acuan warna zat pewarna alami batik yang dibuat. Tahapan standarisasi pewarna alami dimulai dengan pemeriksaan taksonomi/determinasi, preparasi pewarna secang dengan cara ekstraksi, proses standarisasi yang meliputi proses standarisasi pewarna alami dan pembuatan standar pewarna sintetis sebagai pembanding, penetapan standar warna, aplikasi zat warna terstandar pada proses pembatikan meliputi pembuatan pola batik dan pembatikan dengan lilin/malam dan proses pewarnaan batik dengan pewarna secang. Analisis data dilakukan secara kualitatif dan kuantitatif terhadap data absorbansi dan panjang gelombang yang diperoleh dari warna merah yang dibentuk oleh pewarna secang. Hasil penelitian menunjukkan bahwa panjang gelombang serapan maksimum standar warna merah diperoleh pada 450,20 nm. Panjang gelombang inilah yang digunakan sebagai standar pengukuran warna merah secang yang diterapkan.(THE DEVELOPMENT OF STANDARDIZATION NATURAL COLOUR FROM BATIK OF STEAM BARK (Caesalpinia sappan L) BY SPECTROSCOPHY METHOD)The purpose of this research is to obtain a method of color standardization which is a consistent assessment of the color formed by secang natural dye, so it can be used as a reference color of natural dyes of batik.Standardization steps of natural dyes included taxonomic examination, preparation of secang dye by extraction, standardization process by spectroscopic measurement, with “rapid” dye as standard, application on batik process including batik pattern making and wax application on batik and batik coloring process with secang dye. Data was analized by absorbance vs wavelength obtained from red color formed by secang dye. The results showed that the maximum absorption wavelength of the standard red color was obtained at 450.20 nm. This value is used as the standard red color measurement
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