10/05/2026
This week's History Nugget is brought to you by the Edisto Island Historic Preservation Society. Enjoy.
DID YOU KNOW…
Chances are, you probably take the blue color of your favorite jeans for granted, but it was once highly valued, especially in the British Empire. While you may be familiar with the process of making the indigo dye, there’s one surprising step in the process that used to be a critical part of creating the dye. And, that step involves urine!
Even though the indigo plant eventually produces the familiar blue color, actually no part of the original plant is blue. It does, however, contain a compound called indicant that is the dye’s precursor, and urine plays a critical part as a source of the ammonia needed for dying the textiles. This process remained prevalent until the 1850s, when synthetic ammonia was developed from nitrogen and hydrogen, and the use of urine was no longer in practice.
In the mid-1740s, Edisto Island planters were among the first to jump on the indigo bandwagon and were heavy producers during its brief heyday. Indigo was very successful in the Caribbean, and it was introduced in the Charleston area by Eliza Lucas Pinkney in 1744, who got the seeds from her father when he lived in the islands. The variety of indigo grown in the lowcountry was brought from the West Indies. Several Edisto Island plantations got their early starts on profits from indigo, including Old House, Brookland, and Brick House. Did you know that the original American flag was made from indigo textiles.
The processing of the indigo plant into dye was a very unpleasant and labor intensive process. Indigo grew on high ground not needed for rice, and it was also harvested and processed before cotton, so both crops could be grown on the same plantations with the same amount of enslaved labor.
England received almost all Carolina indigo exports, although by the 1760s a small percentage was being shipped to northern colonies. The Revolutionary War essentially brought the indigo trade to a screeching halt, as the colonies lost their best customer. It has recently seen a resurgence in popularity thanks to several artisans who create the dye as well as give classes in making indigo. Rest assured that urine no longer plays the critical part in the process that it once did.
DID YOU KNOW…
Chances are, you probably take the blue color of your favorite jeans for granted, but it was once highly valued, especially in the British Empire. While you may be familiar with the process of making the indigo dye, there’s one surprising step in the process that used to be a critical part of creating the dye. And, that step involves urine!
Even though the indigo plant eventually produces the familiar blue color, actually no part of the original plant is blue. It does, however, contain a compound called indicant that is the dye’s precursor, and urine plays a critical part as a source of the ammonia needed for dying the textiles. This process remained prevalent until the 1850s, when synthetic ammonia was developed from nitrogen and hydrogen, and the use of urine was no longer in practice.
In the mid-1740s, Edisto Island planters were among the first to jump on the indigo bandwagon and were heavy producers during its brief heyday. Indigo was very successful in the Caribbean, and it was introduced in the Charleston area by Eliza Lucas Pinkney in 1744, who got the seeds from her father when he lived in the islands. The variety of indigo grown in the lowcountry was brought from the West Indies. Several Edisto Island plantations got their early starts on profits from indigo, including Old House, Brookland, and Brick House. Did you know that the original American flag was made from indigo textiles.
The processing of the indigo plant into dye was a very unpleasant and labor intensive process. Indigo grew on high ground not needed for rice, and it was also harvested and processed before cotton, so both crops could be grown on the same plantations with the same amount of enslaved labor.
England received almost all Carolina indigo exports, although by the 1760s a small percentage was being shipped to northern colonies. The Revolutionary War essentially brought the indigo trade to a screeching halt, as the colonies lost their best customer. It has recently seen a resurgence in popularity thanks to several artisans who create the dye as well as give classes in making indigo. Rest assured that urine no longer plays the critical part in the process that it once did.