If you believe that only pressure can have an effect on platinum, think again. Like other metals, platinum will react with certain substances, just as iron forms rust when exposed to moisture. Because platinum is malleable, it can melt faster than other metals. And while it doesn’t melt when soaked in most acid solutions, it will dissolve in aqua regia, a mixture of hydrochloric and nitric acids. It can also melt in alkali such as sodium hydroxide and limewater. But you probably won’t come across this scenario too often!
Regardless of which jewellery shop in Reading you bought your platinum ring from, it will undergo a certain degree of chemical change when exposed to any of those substances. So if your job involves the use of those compounds, better take off your platinum ring before starting to work.