• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 力(strength; power)
• 口(mouth; speech)

Adding uses strength and words to increase.

• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 力(strength; power)
• 口(mouth; speech)

Adding uses strength and words to increase.