Ngân hàng an toàn hơn nhờ ...bướm
ừ những cánh bướm đầy màu sắc các nhà khoa học đã nghiên cứu đưa ra phương thức chống giả mạo giấy tờ mới độc đáo và hữu hiệu.Từ lâu, hình ảnh những con côn trùng, con bọ cứng và bướm đầy màu sắc luôn luôn cuốn hút các nhà vật lý và các nhà sinh học. Cánh bướm có nhiều màu sắc óng ánh. Khi gặp nguy hiểm cánh của chúng chuyển sang màu xanh lá cây khiến kẻ thù khó nhận biết được. Chính cơ chế quang học phức tạp này đã giúp cho các nhà khoa học tạo ra phương thức chống giả mạo mới.
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