Bloom the yeast by whisking together the warm milk, sugar, and yeast. Let stand for 5 moments to bloom. If the yeast mixture does not become frothy after 5 minutes, your yeast may be dead, in which case you need to start over.
1⅔ cups milk, 3 tablespoons sugar, 2½ teaspoons instant yeast
In a large bowl, whisk together the flour and salt.
4 cups all-purpose flour, 1½ teaspoons kosher salt
Once the yeast has bloomed, add it to the flour mixture along with the butter and molasses. Whisk briefly to bring together slightly before kneading to bring it together completely. Once the dough is smooth, divide into 4 equal balls.
3 tablespoons unsalted butter, 2 tablespoons unsulphured molasses
One by one, add food coloring into each ball of dough, kneading well to fully incorporate. It took me about 5 minutes of kneading to incorporate the amount of color necessary.
Yellow food coloring, Green food coloring, Purple food coloring, Black food coloring
Once all of the balls are sufficiently colored, place them onto a baking sheet to rise. Leave at least 6 inches of space between them to allow them to rise. Cover with a damp towel and let them rise for about 30-45 minutes, or until doubled in size.
While the dough rises, spray a 9x5-inch loaf pan with nonstick spray and set aside.
Once the dough balls have risen, roll them out. Begin by placing the yellow ball onto a well-floured surface. Roll out into a rough 9x9-inch square.
Next, roll out the green in the same manner. Place on top of the yellow sheet of dough. Follow with the purple dough and then the black. Flip the layered dough squares over so that the yellow is on top and the black is on the bottom. Use a rolling pin to roll the squares out together into a rectangle about 9 inches wide and 13 inches long.
Starting from the short side, roll the dough into a log like cinnamon rolls.
Place the dough into the prepared loaf pan. Cover with a damp towel and let rise for 30-45 minutes, or until doubled in size. Preheat the oven to 350°F while dough rises.
Place the risen dough into the oven to bake for 35 minutes, or until a toothpick inserted comes out clean (internal temperature should be 190°F). Remove from the oven and place onto a cooling rack to cool. Slice and serve.