The agar material offers the excellent elasticity needed to reproduce details, but it's inferior in dimensional stability so that it swells by absorbing moisture and contracts due to evaporation when exposed to the air for a prolonged period of time.
寒天印象材は弾力性があり細部再現性は良好であるが、寸法安定性が悪く水分を吸収すれば膨張し大気中に長時間放置すれば寒天内の水分が蒸発し収縮してしまう。