JB Cases said:There is no difference.
I have purchased nearly one million pieces of chalk from Tweeten. Triangle and Master chalk are EXACTLY the same with a different wrapper. Triangle as a brand was created for the British market.
John you are partly correct, the Chalk made today is the same. However, until the 1960's Triangle chalk was made by a different company called Kieckhelfer Manufacturing Company, not Tweeten. I don't know when Tweeten came on the seen, however, I do know that Kieckhelfer went out of business in the 1960's. I have found references to Kieckhelfer going back to the turn of the century and ending in the 1960's. In the late 1960's or very early 1970's Tweeten comes on the scene and starts selling Masters Chalk and re-markets Triangle under their name. I suspect they bought the rights for Triangle Chalk from Kieckhelfer, along with a number of other items. The above dates may vary slightly, but not much, like most on the forum know I an a major collector billiard related items, and that I have done a lot of research in this area.
Below is my private reserve of chalk that I have purchased and saved over the years with approximate dates that the items have come from.
Below are old box's of Triangle chalk manufactured by Kieckhefer, both box's are from the 1950's or early 1960's and at that time chalk only came in Blue, Green, and I have also seen Red like the Chalk pictured in the first two photo's.


Below is my supply of Masters Chalk without the Flag, the Chalk Pictured is from the early 1970's. Originally this Chalk came in Blue and Green only to my knowledge.

Below is a comparison of the Box's that Masters Chalk came in then, and comes in now. The major difference is the design of Deer or Elk Head on the box. The Center box of Masters is what is currently being produced, the box's to the right and left are old Pre-flag masters Chalk.

Below is another difference between the new and the old Masters Chalk, and that is color. The new chalk with the Flag is a darker Blue and less Gritty, and the old Masters Chalk is lighter Blue and at least twice if not more Gritty.

I have heard all the stories about why the Chalk was changed in the late 1980's or early 1990's, however, I have never been able to confirm that it was because of Lead or anything else. But, I can say without a doubt the older Triangle and Masters chalk will stay on your tip better than the new formula, I think this is because it was more Gritty and it would dig into the tip better. I certainly prefer the old over the new for both Masters and Triangle.
Hope this information and photo's help!!:smile: