April 15, 2011
Egg decorating is an art practiced worldwide and is especially popular in springtime. The eggs pictured here are pace eggs, traditional Easter eggs from northern England, whose origins date back hundreds of years. The eggs are dyed by boiling in water with onion skin and a small amount of vinegar. When the skin of red onions is used, the result is a surprising combination of red and olive green. The red onion acts as a pH indicator, turning red when coming into contact with the vinegar's acetic acid, and green when reacting with the calcium carbonate of the egg shell.