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# Black non-dun1
- URL: https://equinecolors.com/black-nd1/
- Published: 2025-11-26T12:33:17.000Z
- Updated: 2026-08-10T10:43:50.000Z
- Description: Black non-dun1 (or nd1) is a horse color caused by nd1 on a black base. Primitive markings are present.
- Author: Hannelore Roodhooft
- Tags: Colors, Dilutions, #Import 2026-08-12 09:42

## Appearance

| Foals | ![Black non-dun1 foal](https://equinecolors.com/content/images/2025/11/blacknd1foal.png) | Regular [black](https://equinecolors.com/Black/) foal color with [**primitive**](https://equinecolors.com/dictionary/#:~:text=a%20bay%20horse.-,Primitive%20markings,-Primitive%20markings%20may)markings. Leg primitives may be harderto see. |
| ----- | ---------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

| Non-dun1 on a **black base** causes**primitive markings**. Nd1 may makehorses more susceptible to [**sun-fading**](https://equinecolors.com/dictionary/#:~:text=around%20the%20eyes.-,Sunfading,-Sunfading%20or%20sunbleaching).They may also have **lighter inner ears**. | ![Black non-dun1](https://equinecolors.com/content/images/2025/11/blacknd1.png) | Adults |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- | ------ |

### Mimics

Primitive markings can be harder to see on a black base.

![CTA Image](https://equinecolors.com/content/images/2025/12/Equinecolors_Icon_MagnifyingGlass-8.png) 

Beige or greyish inner ears can be a clearer sign of nd1.The dun dorsal stripe goes through the tail, while nd1 dorsal stripes don’t.Dun is more likely to cause striping at the back of the ears than nd1.Foals with dun tend to have a darker lower face mask, while nd1 foals have a darker forehead.

## Genetics

Black non-dun1 is the result of a **black base** with **one or two copies of nd1**. Non-dun1 (nd1) is an allele of the **TBX3** gene.

![CTA Image](https://equinecolors.com/content/images/2025/12/Equinecolors_Icon_DNA1-26.png) 

****Black nd1:**  
Black (E/\_ a/a) + nd1/nd1  
Black (E/\_ a/a) + nd1/nd2

Dun (D), located on the same gene, is dominant over nd1, so horses could carry nd1 without it being noticeable but still pass it on.  

**Read more:**  
[Black](https://equinecolors.com/black-dun/) | [Chestnut nd1](https://equinecolors.com/chestnut-nd1/) | [Bay nd1](https://equinecolors.com/bay-non-dun1/)

[Back to Non-dun1](https://equinecolors.com/nd1/)

## Articles

1. Imsland, F., McGowan, K., Rubin, C. J., Henegar, C., Sundstrom, E., Berglund, J., Schwochow, D., Gustafson, U., Imsland, P., Lindblad-Toh, K., Lindgren, G., Mikko, S., Millon, L., Wade, C., Schubert, M., Orlando, L., Penedo, M. C., Barsh, G. S., & Andersson, L.; **Regulatory mutations in TBX3 disrupt asymmetric hair pigmentation that underlies Dun camouflage color in horses**; Nature Genetics (2015)*;* Doi: [10.1038/ng.3475](https://doi.org/10.1038/ng.3475?ref=equinecolors.com)[](https://www.researchgate.net/journal/Genes-2073-4425?ref=equinecolors.com)

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