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Stamped allows dapples, spots, and similar markings to appear as simple shapes such as flowers, hearts, stars, butterflies, or similar.
Stamped should never alter the size or colour, which means stamped spots on a leopard appaloosa should still be the same colour as the other spots, and not be significantly smaller or larger than appaloosa spots can be. Stamped on a plain coat with no pattern genes can only affect normal subtle dapples.
Stamped can affect any gene that causes patterns on the coat. It should only affect mane/tail whree it touches if the gene it's altering does - stamped dapples on a plain coat should not affect mane or tail.
