There is something insidious about green. We look at it and think of nature, calm, hope. We find it on recycling bins, on pharmacy signs, on organic labels. Yet, for centuries, this color enjoyed a far from reassuring reputation: it was the color of instability, deception, poison. Green, deep down, has always hidden its game well.
Before talking about symbols, we need to understand the material. And the material, in the case of green, was a problem for a very long time. Obtaining a stable green was one of the most difficult challenges for medieval painters and dyers. Plant sources (leaves, bark, roots) produced shades that faded quickly in the light, altered with humidity, and reacted poorly with fabric fibers. Mineral greens obtained through chemical oxidation were technically brighter, but often contained corrosive or even toxic substances. In German, not by chance, there was the expression "Giftgrün": poison green.
This chemical instability was not a technical detail: it profoundly shaped the way European societies perceived and used this color. A pigment that could not be controlled was a pigment that could not be trusted. And that distrust transferred, over the centuries, into the collective imagination.
In the Middle Ages and the Renaissance, green was the color of everything that moves, that changes, that escapes. It was associated with chance, with luck, but also with misfortune. Not by chance, on the gaming tables of Venice, cards and money rested on a green cloth: the color of destiny, of that which can smile or betray in an instant.
Green was also the color of jesters, hunters, lovers. Everything that had to do with inconstancy and change found its natural emblem in this color. It is no surprise, then, that green was also the preferred color for depicting ambiguous and dangerous beings: dragons, demons, snakes, creatures that inhabit the thresholds between the world of the living and that of the dead. Theater actors even today, in some countries, avoid wearing it on stage: an ancient superstition, rooted in a time when green was truly considered an ill omen.
There is also a scientific, or rather pseudoscientific, story that penalized green in a surprising way. When, in the 18th century, chemists developed the theory of primary and complementary colors, green was demoted to a secondary color, the result of mixing yellow and blue. For our ancestors, this idea would have seemed absurd: they knew very well how to create green directly, and in the ancient chromatic scale they placed it next to red and black, as an autonomous and fundamental color.
But the theory of complements prevailed and with it, a cultural devaluation of green that reached its peak between the 19th and 20th centuries. Bauhaus, design schools, painters like Mondrian almost entirely excluded it from their own production, relegating it to a second-class color. Under the excuse of conforming to science, art excluded a color that had accompanied humanity for millennia.
Yet green never stopped circulating. Between the 18th and 19th centuries it became the color of American paper money and not by chance, but because in the popular imagination green already evoked gambling, finance, calculated risk. The green dollar brings with it a history of gaming tables and shifting luck that has its roots in the Middle Ages.
Then, during the 20th century, something changed. Being considered the complement of red (the color of the forbidden), green became almost by contrast the color of permission, of the green light, of freedom. Traffic lights, road signs, free zones: green became the color of yes. And when, from the 1970s onward, ecological awareness began to spread in Western societies, green was already there, ready to become the symbol of nature, cleanliness, sustainability.
Today green is everywhere: green zones, green numbers, green energy, green parties, organic products with emerald green labels. It has become the color of the ecological promise, of the return to nature, of environmental awareness. But it is worth remembering where it comes from: from centuries of chemical instability, of associations with the demonic, of luck and misfortune, of poisons and deceptions. Green is a color that has crossed history changing its face in every era, adapting and reinventing itself. Perhaps it is precisely this capacity for transformation, that original instability that made it unreliable in the laboratory, that makes it so perfect for our time, in which everything changes quickly and every certainty has the temporary color of a hope.
