Victorian Sugar Cookies

1 cup sugar
1 cup powdered sugar
1 cup butter
1 cup oil
2 eggs
1 tsp vanilla
1 tsp salt
1 tsp cream of tartar
1 tsp baking soda
4 1/2 cups flour

Mix well. Blend all ingredients together, chill. With floured hands, shape into balls and place on cookie sheet, flatten with bottom of chilled glass dipped in sugar. Sprinkle with colored sugar. Bake 350F until edges are golden.