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Comparing the chemistry of parts vs that of powder feedstock it was determined that for all the tests , the Al content was slightly lower in the parts and that no significant loss of vanadium was noted when printing with new ( fresh ) powders .
 concept or principle: chemistry; machine or equipment: powder feedstock; material: Al; material: vanadium; material: powders
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: chemistry, powder feedstock, Al, vanadium, powders 
Answer:
 concept or principle: chemistry; machine or equipment: powder feedstock; material: Al; material: vanadium; material: powders