All the items from the Hartwig Heyne workshop were hand-made studio items and not molded. They were made in a rustic way and are generally much heavier than molded or more finely made studio ware, giving them a very pleasing heft.  The company's signature glaze was a bright matt color commonly known as 'Yves Klein Blue' (IKB) after the deep ultramarine blue color made famous by the artist Yves Klein, although pieces can also be found with bright red, orange, and yellow glazes.

Production must have been relatively prolific due to the number of their vases that have been found, though not to the mass production levels of the major West German pottery manufacturers.  For many years, the company was mistakenly known to collectors as Hoy Töpferei, most likely due to a misreading of the incised mark 'Hey' which appears on the base of some items.  Other works were signed with Heyne or individual letters and numbers.  More recent examples have a foil label reading "Hartwig Heyne pottery since 1850" and the form and size numbers inscribed by hand on the base.

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