Add a different coloring powder to each bowl and stir to mix in. (see notes)
Add the yeast and salt to each bowl of flour and stir to mix in.
Add 4 ounces of water to each bowl and stir to mix in with a spoon. Let the dough rest for 10 minutes and bring the dough together into a soft ball with your spoon or your hands.
Do 3 envelope folds for each ball of dough, with a 20 minute rest period between envelope folds. (see video for my SIS (simple is smart) how to do the envelope folds.
After the 3rd and final envelope fold cover the bowl and let the dough rise about 45 minutes or until double in size.
After the end of the rise period roll each piece of dough into a rectangle that is about 6 by 12 in inches. Stack the pieces of dough together and gently roll with a rolling pin to compress the dough together.
Starting at the narrow side, roll the dough into a large loaf shaped roll.
Cover and let rise for 45 minutes or until doubled in size. During the last 30 minutes preheat the oven to 425°F (218°C) with an oven stone or steel in the oven. Bake directly on the stone or steel for 30 - 35 minutes or until the center of the loaf is 190°F (87°C) on an instant read thermometer. Loosely tent with foil if the top is over-browning.
Remove to a wire cooling rack. If you like a soft crust, brush the top with butter.
Cool completely before slicing.