The paper industry 's de-inking sludge , which is produced in mills that use recycled fiber when printing ink is removed from recovered paper , is also a suitable raw material .
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: The paper industry 's de-inking sludge , which is produced in mills that use recycled fiber when printing ink is removed from recovered paper , is also a suitable raw material .
### Response: neutral