1663
Due to their specific physico - chemical properties , such as lipophilicity , sticky / buttery - like texture , waxy / creamy foam characteristics , normal washing procedures can lead to an incomplete removal of these materials and / or to mechanical damage to the tissues , resulting in an impaired prediction of the true skin irritation potential of the materials .
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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:
 None