One popular method was to use henna, a natural dye that has been used for centuries to color hair and skin. Henna can produce a variety of shades of red, depending on the type of henna used and the length of time it is left in the hair. Another natural dye that was used was walnut husks, which can produce a dark brown color.
Some women also used tea or coffee to dye their hair. Tea can produce a light brown color, while coffee can produce a darker brown color. However, these methods were not as long-lasting as henna or walnut husks.
In addition to natural dyes, some women also used household chemicals to dye their hair. These chemicals could be harsh and damaging to the hair, but they could produce a wider variety of colors than natural dyes. For example, some women used lye to lighten their hair, while others used peroxide to bleach it.
Overall, women during World War I had limited options for dyeing their hair. However, they were able to use a variety of natural and household methods to achieve the desired results.