Basque PAU Graphic-Plastic Techniques Practice Questions - Basque Country PAU Graphic-Plastic Expression Techniques Examination - UPV EHU (2o Bachillerato 2026) Exam

Why does traditional waterproof India ink (tinta china) become water-resistant once fully dried on paper?

It contains shellac dissolved in borax or ammonia solution, which forms an insoluble resin film upon drying It relies on linseed oil oxidation, which cures into a tough rubbery membrane It undergoes chemical carbonation when exposed to atmospheric carbon dioxide It contains egg yolk proteins that coagulate under ambient ultraviolet light

Correct Answer:

It contains shellac dissolved in borax or ammonia solution, which forms an insoluble resin film upon drying

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