كيف تظهر الخطوط الملونة على معجون الأسنان؟

14 يناير 2014

لا توجد هذه الخطوط داخل أنبوب معجون الأسنان بل تــرسم على المعجون الأبيض قبل
أن يخرج من فتحة الأنبوب بقليل ، وتكون مخزنة بالقرب من فتحة الانبوب من الداخل فى ثنايا خاصة عند الضغط على الانبوب يخرج المعجون الابيض ملون بالالوان الطولية التى نشاهدها على المعجون .

إخترع هذا الأنبوب الأمريكي لوريينس مارافينو وتحصل على براءة إختراع في سنة 1955 واستخدمت شركة سيجنال هذا الأنبوب في أوروبا بداية من سنة 1965.

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