The main component of limestone is Calcium Carbonate.

* Oyster shells are composed of approximately 95% calcium carbonate, with trace amounts of metal elements. 
* The chitin in calcium carbonate, also known as chitosan, acts as a natural bactericide. 
* When calcium carbonate is calcined, it becomes calcium oxide, which in its active oxygen state, can rapidly achieve sterilization and convert toxic formaldehyde in paint into non-toxic formic acid Within A Few Minutes. 
* Even in its original form, calcium carbonate's chitin has bactericidal effects due to its alkalinity, but it takes 1-2 Weeks to achieve this effect.

Therefore, using calcined oyster shell powder as an eco-friendly construction material is an advanced form of calcium carbonate.

石灰石主要成分為碳酸鈣。

* 蚵殼的組成分中約含有95%的碳酸鈣、微量金屬元素。
* 碳酸鈣中的幾丁質（學名）亦稱甲殼素（俗名），即為天然的殺菌劑。
* 碳酸鈣經過鍛燒後成為氧化鈣，為活性氧狀態下，可以在幾分鐘內快速的達成消菌以及將油漆中有毒的甲醛轉化為無毒的甲酸的效果；
* 而原有的碳酸鈣即使幾丁質以其鹼性就有消菌效果，但需1-2週才能達到此殺菌效果。

因此使用鍛燒牡蠣殼粉作為綠建材，是碳酸鈣的更晉級！