No, pure henna powder is made from a plant which has no metallic qualities.
However some Henna dyes used in Europe and America in the late 19th century had metallic qualities as they added iron sulphate, copper sulphate and a whole host of other ingredients to create various colours.
"When diplomats and travelers went abroad, they often took a painter or
photographer with them to record the exotic world, which they did …
richly embellished with their own attitudes and fantasies. The
opulent (though hardly accurate) depictions of Turkish harem life by
Ingres and others caught the imagination of Europeans in the 19th
century just as science fiction motion pictures catch the imagination
of people now, and created demand for products.
When European and American women went to purchase these Oriental wonders: they were sold boxes of “black henna”, “red henna” “blonde henna” and “neutral henna” (also called “white henna”). These were “rastik”, henna, indigo, and cassia for their hair. The westerners had no idea what was in the boxes, nor was precise labeling required at that time.
The term “to henna” became synonymous with dying one’s hair, no matter what plant was used. “Henna” was the universal term for hair dye at the beginning of 1900, and was the safest, most widely used, most reliable hair dye until the technology of
para-phenylenediamine dye was transferred from the textile and fur industry into the cosmetic industry in the late 1930’s." History of Henna - Catherine Cartwright-Jones
However some Henna dyes used in Europe and America in the late 19th century had metallic qualities as they added iron sulphate, copper sulphate and a whole host of other ingredients to create various colours.
"When diplomats and travelers went abroad, they often took a painter or
photographer with them to record the exotic world, which they did …
richly embellished with their own attitudes and fantasies. The
opulent (though hardly accurate) depictions of Turkish harem life by
Ingres and others caught the imagination of Europeans in the 19th
century just as science fiction motion pictures catch the imagination
of people now, and created demand for products.
When European and American women went to purchase these Oriental wonders: they were sold boxes of “black henna”, “red henna” “blonde henna” and “neutral henna” (also called “white henna”). These were “rastik”, henna, indigo, and cassia for their hair. The westerners had no idea what was in the boxes, nor was precise labeling required at that time.
The term “to henna” became synonymous with dying one’s hair, no matter what plant was used. “Henna” was the universal term for hair dye at the beginning of 1900, and was the safest, most widely used, most reliable hair dye until the technology of
para-phenylenediamine dye was transferred from the textile and fur industry into the cosmetic industry in the late 1930’s." History of Henna - Catherine Cartwright-Jones
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