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What is volatile cinder? What types does it have?

Volatile cinder is the residue in the crucible after volatile determination for coal sample.

It has 8 types:

1. powdery

2. adhesion

3. weakly caking

4. caking without fusion 

5. caking with fusion without expansion 

6. caking with slight-expansion and fusion

7. caking with medium-expansion and fusion

8. caking with strong-expansion and fusion