As glaciers flow or recede, there is a mechanical grinding of the bedrock below, which produces glacier flour, or glacier silt. These fine-grained, silt-sized particles of rock are rich in minerals and depending on the type of rock, will produce colours ranging from grey to blue to green. You may have seen this effect in various mountain lakes and rivers.
JOI Guitars is excited to be in possession of 5 sets of these ancient Sitka tops. The tap tone of these tops produces a deep, resonant bass with a clear high finish.