The Pink Gin cocktail is so named due to Angostura Aromatic Bitters giving the main ingredient, gin, a pink tinge. Originally gin at room temperature was...
Instead of martini or gibson, I usually drink pin gin with a slightly different recipe. My gin is usually in the freezer as well as my martini glasses. Pour angostura bitters over a chilled martini glass. With circular movements, the angostura will paint all the glass. Pour out any bitters that didn't stick to the glass. Fill the glass (now painted in brown) with chilled gin and et voila you'll have your pink gin ready to drink.