Synthetic food colours are not advisible. Why ?

Synthetic polymers are

Synthetic fibres are made of

If you want ot purchase a door mat made of synthetic fibre, which synthetic fibre door mat will you select? Why?

On cooling hot zinc oxide, the yellow colour become white. Why ?

In which set does the colour change faster ? Why ?

Synthetic testosterone promotes

The fabrics namely natural, synthetic and blended are available for garments. Which fabrics will you prefer to wear for rare occassions like functions and in routine? Why?

Why the blood is red in colour?