In printmaking, a state is a different form of a print, caused by a deliberate and permanent change to a matrix such as a copper plate (for engravings etc.)
Some recent scholars refine the work of their predecessors, without wishing to create a confusing new numbering, by identifying states such as "IIa", "IVb" and so forth.
A great deal of work was done by art historians during the 19th and early 20th centuries, and most non-contemporary printmakers now have all the states of their prints catalogued.
New states in old master prints are often caused by the adding of inscriptions (signatures, dedications, publishers details, even a price) inside or below the image.
In the late 17th century, a distant relative of the Hopfers, David Funck, acquired 230 of the Hopfers' iron plates, and reprinted these under the title Operae Hopferianae, adding a somewhat crudely scratched number, known as the Funck number, to each one, thus creating a second state of the hitherto unretouched plates.
An example is Forest Marsh with Travellers on a Bank (1640s–1650s), an etching by Jacob van Ruisdael, where another hand later added clouds.