The word "lead" can have a negative connotation. However the "lead" oxide in glass is totally integrated into the molecular structure of the glass which enables manufacturers (like Riedel) to use it. The microscopic roughness of the surface of lead crystal glass helps wine to develop more intense aromas, further adding to its enjoyment. Seams left by the mold can be gently removed through fire polishing, which gives lead crystal pieces an unsurpassed finish in terms of color and brilliance. In terms of decanting, eliciting those aromas and eventually flavors is the main goal so lead is often a positive as opposed to a negative feature.