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Reckitt’s Blue
Remember when Mum used to ‘blue’ the water with Reckitt’s Blue to wash all the whites? I could never quite wrap my head around it – why add blue to make things whiter? It turns out that white fabrics tend to acquire a slight colour cast, often appearing a bit grey or yellow after use. Blue and yellow are complementary colours in the subtractive colour model, and adding a trace of blue to the slightly off-white colour of these fabrics makes them appear whiter. They were also good for bee stings back in the day. Mum would grab that trusty blue bag and apply it to the sting, bringing some relief. Who has fond memories of wash day using Reckitt’s Blue?