Butter was a rarity in the house when I was a kid. But I do remember those margarine bags with the dye pack in them. Ya broke the dye pack by squeezing and then kneaded the bag for what seemed like forever but was likely 20 minutes or so and when the margarine had become a yellowish colour, voila. To this day I can't stand margarine (other than Lactantia, which is a brand from Quebec), and will do without on toast if I have no butter available.