The isabel yellow. The Isabel is one of the first mutations bred in the Netherlands — by a certain Mr. Bright. It can be said that an Isabel is a brown variant with a reduction of melanin. This series includes the Isabel yellow, white and red, where the white background can be influenced by the dominant or recessive white factor. The birds have minimal melanin with fairly short stripes on their backs and flanks, wider in the gray birds. Gray birds always show slightly more phaeomelanin between the stripes. The wing and tail feathers have a soft beige tint that should match the overall color.
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