8630
Optical micrographs showed that specimens with 0.16 % moisture or greater were filled with observable porosity and increased surface roughness .
 process characterization: Optical; machanical property: porosity; machanical property: surface roughness
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: Optical, porosity, surface roughness 
Answer:
 process characterization: Optical; machanical property: porosity; machanical property: surface roughness