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

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

• 糸(silk thread; filament)
• 龶(coarse undyed thread bundle; top part of thread)

Raw silk that hasn't been dyed suggests the meaning of pure, simple, and basic.

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

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

• 糸(silk thread; filament)
• 龶(coarse undyed thread bundle; top part of thread)

Raw silk that hasn't been dyed suggests the meaning of pure, simple, and basic.