Why did Wanda’s hands turn black?

Why did Wanda’s hands turn black? Harkness tried to take this power, steal it, and use it for her own desires, but Maximoff defeated her in the skies over Westview, New Jersey. When she began to absorb Wanda’s chaos magic, the Scarlet Witch’s hands became blackened as the energy was siphoned from her body.

Harkness tried to take this power, steal it, and use it for her own desires, but Maximoff defeated her in the skies over Westview, New Jersey. When she began to absorb Wanda’s chaos magic, the Scarlet Witch’s hands became blackened as the energy was siphoned from her body.
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