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The growth of magnesium hydroxide nanostructures on silk yarn was achieved by sequential dipping steps in alternating bath of magnesium nitrate and potassium hydroxide under ultrasound irradiation .
 Chemical: magnesium hydroxide; Chemical: magnesium nitrate; Chemical: potassium hydroxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: magnesium hydroxide; Chemical: magnesium nitrate; Chemical: potassium hydroxide