Tyvek paper will tolerate full immersion in water for several years without breakdown. White, non-toxic, chemically inert and recyclable. It is manufactured from finely spun polyethylene fibres which are then compressed to form the paper. A4 size, available in standard 55gm or heavy 75 gm.SeaWriter pencils are not suitable for writing on Tyvek.hite, non-toxic, chemically inert and recyclable. It is manufactured from finely spun polyethylene fibres which are then compressed to form the paper. A4 size, available in standard 55gm or heavy 75 gm. SeaWriter pencils are not suitable for writing on Tyvek.
The Medieval Ages, or the Middle Ages, is divided into three main parts as Early Middle Ages, High Middle Ages, and Late Middle Ages. Dark Ages is the Early Middle Ages, which is fixed roughly to be from 400 AD to 1000 AD by historians. The term, Dark Ages, was first coined by the Italian scholar Francesco Petrarca who was otherwise called Petrarch. It is interesting to note that there was religious struggle during the period of Dark Ages.
The Middle Ages are a time period in European history. They started around the year 476 CE when the Western Roman Empire ended, and continued until around the time Christopher Columbus discovered the New World in 1492. The 'Middle Ages' are called this because it is the time between the fall of Imperial Rome and the beginning of the Early modern Europe. This period of time is also known as the Medieval Age, the Dark Ages, or the Age of Faith (because of the rise of Christianity and Islam). When used narrowly, the term Dark Ages refer only to very early period, from 476 to 800 (when Charlemagne became king).