According to the Blenko Glass Company website
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Because of the non-mechanized and mouth-blown process, the sheets will exhibit artisanal features such as surface undulations, small marks and bubbles. These attributes are considered desirable aspects to the handmade nature and tradition. As an intended part of the handmade process these features do not detract from the glass’ safety or quality and are not considered defects but indications of individual craftsmanship and beauty.