Re: I hope that is not the original paint


[Follow Ups] [Post Followup] [Dodge Power Wagon Forum]


Posted by Sherman in Idaho [162.158.104.131] on Monday, January 11, 2016 at 04:50:28 :

In Reply to: Re: I hope that is not the original paint posted by Willy-N [108.162.216.23] on Sunday, January 10, 2016 at 23:57:08 :

Old paint isn't automatically leaded. Lead pigments are white, yellow, and red. Red lead was only used for primer on steel (Gearboxes sometimes, but not automotive sheet metal). Red iron oxide was your usual "barn red", because it's cheap and colorfast. The old school bus or caterpillar yellow was lead chromate. It tends to darken with age, rather than fade like the modern unleaded yellow pigments. White lead (carbonate) was used in all kinds of light-colored paints. Cheaper paints used (and still use) zinc oxide for white. Nowadays titanium dioxide is the universal white, because it has great opacity. One advantage of lead in paint is that when used in oil paint, it reacts chemically with the oil to make a particularly tough coating. It's not just a pigment, but it's actually part of the film chemistry. We don't have that with any of the modern unleaded pigments, but we don't use much linseed oil or soy alkyd paint any more either.

What you'll notice is missing from that list is other colors like green, blue, and black. Those always non-leaded pigments. Green was typically chromium dioxide, blue I'm not sure about, and black was either lampblack or black iron oxide. I believe chrome pigments have also been banned, or at least fallen out of favor, and the modern forest green is some organic pigment that fades easily. Anyway, if your truck was yellow or white, it might have had leaded paint, but with other colors, that's a lot less likely.




Follow Ups:



Post a Followup

Name:
E-Mail:
Subject:
Message:
Optional Link
URL:
Title:
Optional Image Link
URL:


This board is powered by the Mr. Fong Device from Cyberarmy.com