Add in the powdered sugar and almond flour mixture in three parts, 1/3 at a time, folding each part until just combined.
Separate the batter into two parts, transferring half the batter to the small bowl and leaving the other half in the mixing bowl.
Add the orange gel color to the mixing bowl and continue folding until the color is mixed in.
Now you need to deflate some of the air in the batter by taking the spatula and smearing the batter on the sides of the bowl two or three times, and then folding once or twice.
Repeat the process of smearing some of the batter on the side of the bowl and folding until the batter looks smooth and glossy and runs down the spatula slowly in ribbons.
You can test the consistency by lifting the spatula and letting the batter run down. If it falls in ribbons and sinks back into itself within 30 seconds, the batter is ready. Set the bowl aside.
Add the yellow gel color to the other bowl and fold until the color is fully mixed in.
Repeat the process of folding the batter and deflating some of the air by smearing the batter against the side of the bowl.
Now take a piece of plastic wrap, set it on the counter, and pour both batters.
Wrap the plastic wrap, cut one end and place it inside the 16 inch piping bag.