It is genetic - in my family there is no history of it as it is a recessive gene but my mum and dad were both carriers. In Scotland up to 13% of the population has red hair, but around 40% of the population is thought to carry the recessive gene responsible for the world's rarest natural hair colour.
On the other hand, synthetic base oil molecules are chemically controlled, which provides increased ï¬ lm strength and lubricity over petroleum oils. The performance qualities of base oils have a marked impact on the performance qualities of the ï¬ nished product.
The oil reï¬ ning process separates the various types of molecules in the oil by weight, resulting in a concentrated batch suitable for todayâs uses such. as gasoline, LPG, kerosene or base oils for lubricants. The chemical composition of conventional motor oil can vary substantially and depends on the. raw crude oil reï¬ ning process. While petroleum base oils are reï¬ ned, synthetic base oils are manufactured and can achieve a higher performance level.