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Joined:	2 May 2007
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2 May 2007 14:49:15 IST

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colour change of Pb 2+

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why the oil paintings turn black after some time.{considering that it contains Pb2+}?

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kusum

Scorching goIITian

Joined: 1 Dec 2006

Posts: 239

2 May 2007 14:53:12 IST

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hi,
the oil paintings turn Black because of the reaction btw the present lead and hydrgen sulphide from the air to form PbS which is responsible for the black coulouring after some time.

arun-rashi

Forum Expert

Joined: 19 Oct 2006

Posts: 1057

10 May 2007 07:20:08 IST

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ya due to formation of lead sulphide because oil paint contain lead and reacts with H2S present in atmosphere.

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