In 1791. an English clergyman and amateur geologist named Rev. William Gregor made a discovery during his mineral research in southwest England. While examining a substance resembling gunpowder - later identified as a mixture of magnetite and unknown metals - in Menachan Parish. Gregor believed he had found a new element and named it Menachan Mine. Around the same time in Germany. Martin Heinrich Klaproth also discovered the same element independently in a mineral called rutile. He named it titanium after the Titans in Greek mythology. Despite some debate. it is widely acknowledged that Gregor was the initial discoverer because he published his findings first. Nevertheless. titanium became known by Klaproth's chosen name. It wasn't until 1910 that American chemist Matthew Hunt successfully produced pure titanium. but its purification and practical use took several years to develop effectively.

There are three ways titanium dioxide crystallizes: rutile. anatase. and plagioclase. Rutile has square crystals. while anatase and plagioclase have rhombohedral crystals.

Polypropylene. a frequently used plastic in packaging. textiles. and everyday items. can emit volatile organic compounds VOCs. particularly when new. Although its release rate is lower compared to other plastics like PVC. some caution should still be exercised as it can still release chemicals into the air in certain situations such as high temperatures.

However. with time. the levels of VOC emissions typically decrease to relatively low levels. To reduce potential exposure to off-gassing. it is advisable to ensure adequate ventilation in areas where new polypropylene products are present. especially in confined spaces or at elevated temperatures.