A great advantage of pewter is that it actually needs very little looking after. Your first thought of pewter might of that dull grey metal tankard - older pewter like this was shiny when new, but had a high lead content which made it develop a dark grey patina over time. Modern pewter doesn't contain lead like this and so will retain its shininess; it won't go as dark however long you leave it. It will simply develop a subtle patina over time (we’re talking years here).
A lot of modern pewter has been dipped in acid to age it, to give it a patina, and then brushed to bring out the highlights. It’s a nice look, and can bring out the detail in a design very effectively, but it is like buying pre-washed jeans - it is what most people do, and it does look good; but it will never be as good as something that has aged with you over time.
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