18335
New surface - enhanced Raman scattering platforms : composite calcium carbonate microspheres coated with astralen and silver nanoparticles .
 Chemical: calcium carbonate; Chemical: silver
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: calcium carbonate; Chemical: silver