It is done using the inciso technique applied to the surface using a grinding wheel, leaving the surface feeling slightly rough. The glass has a green color with a yellow glow at the bottom. It measures just over 8 inches tall, 4-1/4 inches in diameter at the top and 2-1/4 inches in diameter at the base. It is in excellent condition with only one very tiny nick on the rim that is hard to see with the naked eye. There is no acid etched mark that I can see. It probably had a paper label at one point. The polished bottom does show signs of use from years of being on a shelf. There are no cracks, water marks, scratches or repairs. Truly worthy of any Italian Art Glass collection. Please see all photos. Thank you for your interest. The item “Paolo Venini inciso Italian Art Glass 8-1/4 inch tall Mid-Century Modern vase” is in sale since Thursday, January 19, 2017. This item is in the category “Pottery & Glass\Glass\Art Glass\Italian”. The seller is “coneball” and is located in Eugene, Oregon. This item can be shipped worldwide.