How did animation studios make ghost characters transparent before computers?

How did animation studios make ghost characters transparent before computers?

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Real ghosts haunting the reels.

Water color paints, OP. C'mon.

Ectoplasmic inking process

layers

They killed each drawing so it came back as a ghost.

This

How'd they do the light in webm related?

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this surviving production cel seems completely opaque, implying it was a disney camera trick

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Glow is a higher contrast paint applied after the flame is painted on the celluloid. You can see the glow kinda stumble around a bit when you watch it .