7798
During intersecting jets printing , reactive materials are dispensed separately , colliding and mixing with each other in air before landing on a previously deposited layer .
 material: reactive materials; concept or principle: mixing; process characterization: deposited layer
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: reactive materials, mixing, deposited layer 
Answer:
 material: reactive materials; concept or principle: mixing; process characterization: deposited layer