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Topic: Winter porthole advice needed.
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Ron Yost
Master Film Handler
Posts: 344
From: Paso Robles, CA
Registered: Aug 2003
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posted 08-29-2005 02:24 PM
Frank, titanium is right. Titanium dioxide, in fact.
The whiteness and brightness of paint is directly related to the amount of titanium dioxide it contains. Its refractive index is second only to diamond, according to the Wikipedia reference below. It's titanium dioxide that replaced lead in paints.
Higher-priced paints will contain more of it, as a general rule.
Titanium dioxide is heavy, too. Much heavier than the various fillers that are added to paint, so you can tell the relative amount of titanium dioxide in a paint by comparing the weight of various brands and levels within a brand.
A house painter once told me that the way for an 'amateur' to get a good paint was to go down the shelves of white 'base' paint, lifting a gallon of each brand, then buying the heaviest they could afford .. this was in the days of lead-based paint, but I'd guess his 'rule' still applies.
Wikipedia Titanium Oxide page
Ron Yost
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