20496
Moreover , absorption spectra have revealed an additional single redshifted absorption band ( type II spectrum ) that is assigned to a surface aggregate and is induced by a specific interaction of the dye cation with the negatively charged cuvette wall .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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