Argyro's Sheet

Argyro’s Sheet (アルギロの) is an item found in a storeroom in a sunken dungeon on the 4th Floor of Aincrad. The item is generated as part of the Shipwright of Yore quest.

Official Description
English = A cloth made of silk from a rare aquatic spider. This cloth will hide anything it covers, but only in a place surrounded by water. Japanese = 水中で暮らす珍しい蜘蛛の系で織った布. 周囲を水に囲まれた場所でだけ、この布で覆ったものを見えなくすることができる

Usage Notes
The instant the cloth covers something, the sheet changed to the colour of the surface of the water, making it hardly possible to see the hidden objects ; however, enough light passes through the sheet for people hiding under it to see through it. The durability of the item decreases by approximately ten percent per five minutes when the item’s ability is activated. The lost durability can be restored by repairing it using the Tailoring skill.