Rating: 5/5 Perfect. This review is from: Fosmon PC to TV Converter Box compatible with Windows and Mac (VGA To RCA / VGA To S-Video). Pros: Easy to use and works well with an older TV. Cons: Set to default to black and white, probably why people had some issues with it.ating: 5/5 Perfect. This review is from: Fosmon PC to TV Converter Box compatible with Windows and Mac (VGA To RCA / VGA To S-Video). Pros: Easy to use and works well with an older TV. Cons: Set to default to black and white, probably why people had some issues with it.
âThere are two simple tests you can try to determine whether the leather is chrome, or vegetable-tannedâ. Test 1: Put a small narrow strip of leather in boiling water. If the leather instantly curls up, it is vegetable-tanned.A chrome-tanned leather will just float around in water.Test 2: Burn a piece of leather with a lighter.If you have a vegetable-tanned leather, it will not burn in flames and the ashes will be grey or black. A chrome-tanned leather will burn more easily and its ashes are green.est 1: Put a small narrow strip of leather in boiling water. If the leather instantly curls up, it is vegetable-tanned. A chrome-tanned leather will just float around in water. Test 2: Burn a piece of leather with a lighter.
1 The oldest system of tanning relies on the chemical action of vegetable material containing tannin, or tannic acid, on the protein constituents of skin. Vegetable tanning seems to have been practiced in prehistoric times. In historic times, the Hebrews tanned with oak bark, and the Egyptians, with babul pods. The Romans used bark, certain woods, and berries. The Arabs tanned with bark and roots, and in the Middle Ages they reintroduced the art into Europe via Spain. By the 18th century the value of materials such as oak bark, sumac, valonia, and hemlock was well established.