Violet Factor and Violet Cobalt Budgerigar Mutation, Complete Genetics Guide

The most prized blue-series modifier in budgerigar genetics. Autosomal incompletely dominant, Violet factor adds a deep violet sheen to blue-series birds. The most striking expression is SF Violet Cobalt, historically called Visual Violet and judged in its own exhibition class. Combined with Sky Blue produces Violet Sky Blue (paler lavender wash). Combined with Mauve produces Violet Mauve.

Written by Ayaan Shohan

Founder, KinBird Aviary · Bangladesh

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What Violet looks like on a real bird

A Violet factor budgerigar has a deep violet sheen overlaid on a blue or green base colour. The expression is most striking on Cobalt (one dark factor on blue base), producing the famously prized Violet Cobalt with a deep velvet-purple body. On Sky Blue the violet sheen is softer (Violet Sky Blue with a lavender wash). On Mauve the sheen darkens the body to a near-purple-black.

On green-series birds the violet sheen is largely masked by the existing green pigment. Violet Light Green is barely distinguishable from Light Green by eye, although the gene is genetically present and will visibly express when inherited by blue-series offspring.

The cheek patches of a Violet bird may show a slight violet tint. The wing markings, throat spots, and other melanin features are unaffected — only the structural blue colouration is shifted toward purple.

Single Factor and Double Factor expression

Violet factor is autosomal incompletely dominant. A Single Factor (SF) Violet bird carries one Violet allele; a Double Factor (DF) Violet bird carries two.

SF Violet Cobalt produces the most-prized exhibition expression, often historically called Visual Violet. The body is deep velvety violet with strong sheen.

DF Violet Cobalt is sometimes lighter than SF Violet Cobalt — counter-intuitive but well-documented. The DF expression produces saturation so deep that it shifts toward darker tones, sometimes appearing as near-black violet under exhibition lighting.

Many exhibition breeders prefer SF Violet Cobalt to DF Violet Cobalt for show purposes because SF has more visible violet sheen.

Why Violet Cobalt is the prized expression

The deepest visible violet expression occurs when Violet factor is combined with Cobalt base color (one dark factor). The dark factor deepens the blue colouration; the violet factor shifts the deepened blue toward purple. The result is a velvety violet body with maximum visible sheen.

On Sky Blue base (zero dark factors) the violet sheen lacks the depth that dark factor provides. On Mauve base (two dark factors) the colouration shifts so dark that the violet sheen becomes hard to distinguish from near-black.

The Cobalt + Violet combination has been judged in its own exhibition class for decades, formerly called Visual Violet and now uniformly labelled Violet Cobalt on most exhibition standards.

How Violet inheritance works

Violet factor is autosomal incompletely dominant. The gene sits on an autosome, so it inherits identically in cocks and hens. The 1:2:1 Mendelian ratio appears in SF Violet × SF Violet pairings: 25% Normal, 50% SF Violet, 25% DF Violet offspring.

DF Violet × Normal produces 100% SF Violet offspring (every chick inherits one Violet allele).

DF Violet × DF Violet produces 100% DF Violet offspring.

The gene is independent of dark factor (Sky Blue / Cobalt / Mauve series), so Violet expression on any given base color depends on which dark factor the bird inherited.

Violet × Cobalt pairings, the prized combination

To produce Violet Cobalt offspring at the highest rate, breeders pair SF Violet Cobalt × Cobalt. This produces 50% Cobalt and 50% Violet Cobalt offspring.

For higher Violet Cobalt yields, pair DF Violet Cobalt × Cobalt. This produces 100% SF Violet Cobalt offspring — every chick inherits exactly one Violet allele.

For breeders trying to fix Violet into a Cobalt line permanently, DF Violet Cobalt × DF Violet Cobalt produces 100% DF Violet Cobalt offspring. However, DF Violet Cobalt is often less visually striking than SF Violet Cobalt as discussed above.

Violet combinations with other mutations

Violet Opaline on Cobalt produces a violet-sheen body with the wing-reversal pattern of Opaline.

Violet Cinnamon Cobalt produces violet body with brown wing markings.

Violet Spangle on Cobalt combines reverse wing markings with violet body sheen. SF Spangle SF Violet Cobalt is a popular show combination.

Violet Grey factor on Cobalt produces a darker, more muted violet.

Violet Yellow Face on Cobalt produces a yellow-face bird with violet body sheen.

Violet on green series is genetically tracked but has minimal visible effect.

History and origin

Violet factor in budgerigars has been documented in European aviaries since 1928, with the earliest stable Violet lines traced to Belgian breeders. The mutation entered British exhibition lines during the 1930s and Australian lines in the 1940s.

By the 1950s Violet Cobalt was an established exhibition class. Modern WBO standards classify Violet Cobalt (SF) and DF Violet Cobalt together with Cobalt-based variants, judged for body colour saturation, sheen quality, and contrast with wing markings.

Violet pairing predictions in the calculator

The Budgerigar Genetics Calculator handles all Violet pairings including SF vs DF Mendelian ratios, combinations with dark factor, and combinations with all other mutations. Select Violet Factor as a mutation on either parent, choose SF or DF, and the engine outputs offspring percentages.

Try SF Violet × SF Violet for the textbook 1:2:1 ratio. Try SF Violet Cobalt × Sky Blue to see dark factor segregation with Violet on top. Test any pairing at budgerigargenetics.com.

Frequently asked questions about violet mutation

What is the Violet factor in budgerigars?

Violet factor is an autosomal incompletely dominant budgerigar modifier that adds a deep violet sheen most strikingly on blue-series birds. Single Factor (SF) and Double Factor (DF) expressions differ measurably. SF Violet Cobalt is the most prized exhibition expression.

What is Violet Cobalt?

Violet Cobalt is the most striking Violet factor expression — a Cobalt base (one dark factor on blue base) carrying Violet factor. The combination produces a velvety violet-purple body with deep sheen. SF Violet Cobalt is the most prized show expression and was historically called Visual Violet.

Why is SF Violet Cobalt prized over DF Violet Cobalt?

Counter-intuitively, SF Violet Cobalt often shows more visible violet sheen than DF Violet Cobalt. DF Violet Cobalt produces a saturation so deep that the colour shifts toward near-black under exhibition lighting, losing the visible velvet sheen that SF Violet Cobalt displays.

How does SF Violet × SF Violet inheritance work?

SF Violet × SF Violet produces the textbook 1:2:1 Mendelian ratio: 25% Normal, 50% SF Violet, 25% DF Violet offspring. This is one of the cleanest demonstrations of autosomal incompletely dominant inheritance available to budgerigar breeders.

Does Violet factor affect green-series birds?

Genetically yes — the gene is inherited identically in cocks and hens regardless of base color. Visually the Violet sheen is largely masked by the existing green pigment, so Violet Light Green looks nearly indistinguishable from Light Green by eye. The gene is still passed to offspring.

Can Violet combine with Opaline or Cinnamon?

Yes. Violet Opaline on Cobalt produces a violet-sheen body with wing reversal. Violet Cinnamon Cobalt produces violet body with brown wing markings. Violet Spangle, Violet Yellow Face, Violet Grey, and many other combinations all work.

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