Category "Poster", 8. – 10. grade
Ivayla Nikolova, 10th grade[1]
Supervisor: Mariyana Georgieva
134th “Dimcho Debelyanov” Secondary School – Sofia (Bulgaria)
https://doi.org/10.53656/nat2025-3.15
Abstract. Swiss banknotes use innovative and resistant pigments to achieve rich colors and protect against counterfeiting. The yellow color of the 10-franc banknote is due to arylide yellow, a non-toxic organic pigment with excellent resistance. The red 20-franc banknote uses synthetic iron oxide and metallic pigments of aluminum and bronze, replacing the previously used toxic cinnabar. The green 50-franc banknote contains chromium oxide, a hard and refractory pigment. The blue 100-franc banknote uses phthalocyanine, a stable organic compound with unique optical properties. In addition to its technological advantages, each banknote carries a symbolic message: time, creativity, nature and knowledge - expressed through hands holding objects with deep meaning.
Keywords: color; sustainability; symbolism
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