On 30/05/2015 11:49, Dave Plowman (News) wrote:
In article ,
Nightjar cpb@ insert my surname here.me.uk wrote:
They changed to titanium dioxide because it overcame the problem of
white lead yellowing when exposed to coal fire smoke.

Nothing to do with lead being banned from most paints?


Titanium dioxide was introduced as a paint pigment in the 1950s. Lead in
paint available to the public was banned in 1992.

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Colin Bignell