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Why use lead in paint? | News | Chemistry World

Why use lead in paint? | News | Chemistry World

Any paint that relies on lead compounds for its colour. White lead, or lead(II) carbonate (PbCO3), is a typical example, and was once widely used to paint wooden surfaces in homes. Other lead compounds, like vivid yellow lead chromate (PbCrO4), were used as coloured pigments. As well as giving the paint its tint, lead pigments are highly opaque, so that a relatively small amount of the compound can cover a large area. White lead is very insoluble in water, making the paint highly water-resistant with a durable, washable finish.?

Lead carbonate can also neutralise the acidic decomposition products of some of the oils that make up the paint, so the coating stays tough, yet flexible and crack-resistant, for longer.

I really hate washing out containers for recycling β™»

Mayonnaise jars, peanut butter jars, pasta jars.

They all come in plastic these days. Increasingly thin plastic too as material science evolves. When they get used up, what is left is just a sticky residue that is difficult to remove before tossing in the recycling bin, requiring and wasting a lot of soap and water. They are just so much easier to chuck in a hot fire, let them turn into carbon dioxide that will become plant food. Especially when you know so much of urban recycling is a feel good scam. I can’t wait to own my own land out in the country.