Square sails are square
Either a marconi or lanteen rig
Lanteen sails
Lanteen sails were used by the ancient Egyptians and many other Mediterranean countries too
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Not all of the sails are white only sails made out if Dacron are white. But sails made out of carbon are black.
In the past, sails were made out of a material called 'sailcloth' or 'canvas' which was originally made from hemp/flax fibers (linen). After the discovery of cotton this too was used as the source of fiber. In modern times, sails are rarely made from natural fibers and most sails are now made from synthetic fibers including nylon, polyester, aramids and carbon fibers. These sails are stronger and will not let the wind though. (In the past sail canvas had to be sluiced down to make it impervious to the wind - this made the sails and rigging heavy).
sails
Quality sails on yachts are made of high grade duck cloth or canvas. There are also some quality plastic sails, but they are quite unusual to see in use.
1588
woven
Around 2,300 BC