Influence of sunlight on absorption spectra of Rhizophora Apiculata dye solutions

The induced colour changing of dyes under the effect of radiation has been sufficiently documented in literature. Most of the reported experimental work has been done on aqueous aerated acidic or alkaline dye solutions. The main objective of this research project is to study the effect of sunlight exposure on natural dye solutions which extracted from Rhizophora Apiculata tree. The Rhizophora Apiculata dye solutions were prepared by soaking the Rhizophora Apiculata bark in an organic solvent for 7 days. The sunlight exposure is carried out at room temperature up to 30 days. The absorbance measurements of the dye solutions were measured by using UV-Vis spectrophotometer (Palo Alto, CA). The Rhizophora Apiculata dye solutions absorbance were found at the absorption band of 665 nm and decrease with increasing of day exposure.