What is tk red lemonade?

from wikipedia

“Lemonade in Ireland comes in three varieties, known as red, brown and white. Red lemonade is one of the most popular mixers used with spirits in Ireland, particularly in whiskey. Major brands of red lemonade include TK (formerly Taylor Keith), Country Spring, Finches and Nash’s.”

Apparently, it is carbonated, and there are different colors: http://irishherault.wordpress.com/2009/08/29/irish-red-lemonade-french-pink-limonade/