Preheat oven to 450 degrees Fahrenheit.

Sift together flour, baking powder, sugar, cream of tartar, baking soda, and salt into a large bowl.

Cut in the chilled butter using a pastry blender or your fingers until the mixture resembles coarse crumbs.

Make a well in the center of the flour mixture.

Add buttermilk all at once and stir just until the dough clings together.

Gently knead the dough about 10-12 times on a lightly floured surface.

Pat the dough out to 1/2 inch thickness.

Cut out biscuits with a 2 1/2 inch biscuit cutter or a glass.

Dredge each biscuit in the melted butter.

Place the biscuits on a baking sheet.

Bake for 10-12 minutes, or until golden brown.