A lacquer disc (or acetate) is a highly specialized, blank master record used as the crucial first step in vinyl manufacturing. It consists of a rigid aluminum core perfectly coated with a soft, nitrocellulose-based lacquer. During mastering, a cutting lathe uses a sapphire or ruby stylus to carve the audio waveform as a continuous, wiggly spiral groove into this soft surface. [1, 2, 3]
Because the lacquer surface is soft enough to be cut but firm enough to hold its shape, these master discs provide a flawlessly smooth groove wall, resulting in the warm, dynamic sound characteristic of high-fidelity vinyl. [1]
The Vinyl Manufacturing Chain
Once a lacquer disc is cut by an engineer, it cannot be played repeatedly without degrading the soft lacquer, though it serves as the master source for mass production. To turn it into standard vinyl records, it goes through a multi-step electroplating (or galvanic) process at a pressing plant:
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