Seals were used to seal important letters or communications. The idea was each seal was unique and when a paper was folded up.a large drop of wax was dropped onto it and the metal seal firmly placed in it making a unique pattern so anyone could easily see if it had been opened.
I am not sure what you mean by the " olden days". That can be 20 years ago to a thousand years. Please make the question more specific to get an answer.
Discuss the purification methods used in the olden days
It all depends on what sense you are speaking of; because in the "olden days," as you say, candles were used in order to provide some light in dark places.
The moon and stars.
cotton wool
they used sun dials
Discuss the purification methods used in the olden days
in the olden days we used smoke,light reflection and beacons
Discuss the purification methods used in the olden days
Cloth.
on the water.
In the olden days there were no banks so people used to keep their money under their heads
letters
guns and cannons
In the olden days it was used for entertainment.
It all depends on what sense you are speaking of; because in the "olden days," as you say, candles were used in order to provide some light in dark places.
the roads were used for carriges and horses to get transport in the olden days.
wooden and clay tablets