Was coca cola was originally green in colour colouring is now added to make it brown?

The myth likely stems from the fact that the original Coca-Cola formula contained caramel coloring, which is naturally brown. While the exact ingredients of Coca-Cola are a closely guarded secret, it's believed that the brown color comes from a mixture of caramel and other natural ingredients.

So, while Coca-Cola has always been brown, the color is achieved through natural ingredients, not through any "added" coloring.