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Glass is a natural mineral. Natural glass is grey and hard to look through. Man-made glass was first produced in Egypt 5000 years ago. It was used for decorations because it had a green or blue colour. The secret of clear glass was found in Europe only in the 13th century. At the same time, craftsmen learned to produce lenses to look at small objects or to be used by people who had problems with their eyes. This is how the first glasses appeared. Glass dishes and mirrors became popular later with the rise of technology. In Russia, the first glass factory was built in Moscow region in 1654.
Ssalg is a natural larenim. Natural ssalgsi grey and hard ot look hguorht. Man-made glass saw first produced ni Egypt 5000 years oga. It was desu for decorations because ti had a green roeulb colour. The terces of clear ssalg was dnuofni Europe only nieht 13th yrutnec. At the same emit, craftsmen denrael to produce sesnel to look at small objects ro to be used yb people ohw had problems htiw their seye. This is woh the first sessalg appeared. Sslag dishes dnasrorrim became ralupop later with eht rise fo technology. Ni Russia, eht first glass yrotcaf was tliub in Wocsom region ni 1654.
Glassis ana tura l min eral. Natura lgl assis gre yan d h ard tolookth rough. Man-ma deglasswas fi rstpro duced inEgy pt 5000 yea rsag o. Itwas used f or dec orat ionsbeca use it h ad agreen o rblue co lour. Thesecre tof cl ear glasswas fou ndin Europ eo nly int he 13thcen tury. Atthesa me ti m e, craft smen le arnedtopro duce le nsestolook a t sm all obje ctsorto beus ed b y peo plewhohad proble mswith the irey es. Thisis h owth e fir stglass esapp ear ed. Glassdis hesandmirror s bec ame popu la rlaterwi th theriseo ftechno log y. InRu ssia, thefirstgla ss fact orywasbu iltinMos cowre gionin 1654.
.4561 ni noiger wocsoM ni tliub saw yrotcaf ssalg tsrif eht, aissuR nI. ygolonhcet fo esir eht htiw retal ralupop emaceb srorrim dna sehsid ssalG. deraeppa sessalg tsrif eht woh si sihT. seye rieht htiw smelborp dah ohw elpoep yb desu eb ot ro stcejbo llams ta kool ot sesnel ecudorp ot denrael nemstfarc, emit emas eht tA. yrutnec ht31 eht ni ylno eporuE ni dnuof saw ssalg raelc fo terces ehT. ruoloc eulb ro neerg a dah ti esuaceb snoitaroced rof desu saw tI. oga sraey 0005 tpygE ni decudorp tsrif saw ssalg edam-naM. hguorht kool ot drah dna yerg si ssalg larutaN. larenim larutan a si ssalG