Many people have asked me about Milk Oolong (AKA Jin Xuan oolong). The Jin Xuan varietal of tea plants has been said to carry a natural milk flavor. At least 15 years ago (or longer), I had my first taste of Milk Oolong in Taiwan. I remember it was special and that I liked it.
A tea friend told me that there was one year that Milk Oolong won a very special and highly-regarded prize in a Taiwanese tea competition, after which, more and more people asked for this kind of tea. Some dishonest merchants and farmers saw that they could make a lot of money by blending some milk flavoring with the tea. Newspapers and the TV news reported on the many fake Milk Oolong teas and over time, people forgot about this tea.
Nowadays in Taiwan, I rarely hear people talking about Milk Oolong, and when I do, it is usually not a local resident that is looking for this tea. I have asked many tea farmers and tea people why Jin Xuan can't produce the natural milk flavor anymore. No one seems to know the answer to this question.
In the past two years, some customers have brought over various Milk Oolongs for me to try. It has been very disappointing to find such strong milk additives in those tea samples. I am not trying to prove that all Milk Oolong is bad, since I did have some good experiences with it in the past. Before you purchase one, you might want to ask the tea merchant if it's a blended one, and if she is honest, she will tell also teach you how to tell the difference between a genuine Milk Oolong and a fake one with milk flavoring.