I thought about it, if you think about it you would come up with the answer yourself.

The Cinnamon and Black Pastel mutations are inherited in what is called Co-Dominance or Incomplete Dominance. That means that the presence of ONE mutated gene (Cinnamon or Black Pastel) will "dominate" over the normal (non-mutated) gene and the phenotype of the offspring will be different from the normal phenotype. An animal with TWO mutated genes will look different from the ones with only ONE mutated genes (in what we call the SUPER form). Regular Dominance is when ONE mutated gene overrides the normal gene, but the phenotype of an individual with one gene is identical to that of an individual with two genes for that particular mutation.

Cinnamon and Black Pastel are two closely related mutations of the same gene. For simplicity let's call them "C1" for Cinnamon and "C2" for Black Pastel. The normal gene in this case would be "c".

When you cross a cinnamon with a Black Pastel you are crossing individuals with the genotype "C1c" and "C2c", C1c being the Cinnamon (one Cinnamon gene and one Normal gene), and C2c the Black Pastel (one Black Pastel gene and one Normal gene).

The Cinnamon will produce two kinds of gametes: one with the gene C1 and one with the gene c. The Black Pastel will produce also two kinds of gametes: one with the gene C2 and one with the gene c. By combining the four kinds of gametes you will get four possible combinations: C1C2 (Super Cinnamon-Black Pastel), C1c (Cinnamon), C2c (Black Pastel) and cc (Normal). That's how you get normals out of a Cinnamon x Black Pastel cross.
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