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white silk
prime
principle
「素」 has other readings with different meanings.
素のままの味が一番美味しいと思う。
I think the plain taste is the most delicious.
彼女は素直で付き合いやすい人だ。
She is honest and easy to get along with.
素の状態で食べるのが健康に良いらしい。
Apparently eating things plain is good for health.