dk nkf - Nordisk Konservatorforbund Danmark

Figure 4. The turbines, one original and one repainted some years ago. Credit: Jan Haug/Hedmarksmuseet photograph library.
and water running into the machine hall every spring
lead to corrosion at the base of machines exposed for
water.
The forth deterioration agent to consider is what we
call physical.
Here we talk about physical forces generated in
Klevfos by staff and visitors. Some areas are used
by the theatre actors, for instance the office in the
Hollenderiet.
The chemical agents of deterioration are “aggressive”
chemicals in the form of gases, liquids or solids,
which react or interact with materials and cause
e.g. corrosion. We will have to ask questions and
undertake some research: What kind of dust and
deposit do we actually have? Is it alkali, is it a result
of acidic action, could it be salt efflourecense from
the building material? If the dust is aggressive it has
to be removed. If what we see is salt efflourecense it
could be caused by problems with drainage of water
or leaks in roofing.
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It is obvious that the soda gave rise to problems for
the wooden beams in the soda house which initially
had to be exchanged regularly. The ovens for
steaming of black lye also have problems because
of the lye. Residues of caustic soda are difficult to
get rid of in brick walls.
In other parts of the paper mill the paper making
processes provided less hazardous chemicals.
We may look upon dust from another point of view:
How much dust is “historically correct” in a paper
machine hall? There were no investments in new
production equipment the last 30 years at Klevfos,
but that does not mean that it was all dirt and disorder.
In some parts of the Pulp and Paper Mill it had to be
very clean, other parts were dirtier. The laboratory
was clean, and the fire room not so clean.The paper
machine hall also had to be clean, especially the
steel cylinders for pressing and rolling paper.
We do need to make up a routine for cleaning; having
in mind the patina of the museum, the historic dirt,
must be left.