คำตอบที่ 34
เจอและ คล้ายๆ กะที่บอกไว้ 
ของเหลวสีน้ำตาลเค้าเรียกว่า electrochromic gel อาจจะเป็นไปได้ว่า ก่อนที่มันจะเสีย มันอาจจะไม่ใช่ของเหลวเป็นน้ำมั้งครับ...ยังมีมั้งเสมอ
In auto dimming mirror technology, a forward-looking sensor detects low ambient light from headlights behind the car and directs the rear-view sensor to look for glare. The mirrors darken automatically in proportion to how bright the glare is, then clear once the glare is no longer detected. The technology is called electrochromics, which applies electricity in order to tint glass through a low-voltage power supply. The electricity moves through an electrochromic gel placed between two pieces of glass during manufacturing, which have been treated with an electrically conductive coating. Electrochromic technology is also increasingly included in building design with the use of so-called "smart windows," as an energy-efficient response to light and heat.
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