CORONA® GOLD
CORONA®SILVER
Heavy-metal-free gold printing inks
Low-aluminium silver printing inks
System description
Gold and silver printing inks are used for applications such as attractive labels and packages
designed to produce a product appearance and appeal that will stimulate sales.
Bronze printing inks are used to produce metallic effects in applications such as label and
package printing. Traditional gold bronze inks contain brass (a copper/zinc alloy) as their
metallic pigment. Silver printing inks contain aluminum as their metallic pigment.
New gold and silver printing inks containing a new special aluminum pigment have been
developed
by the HUBER-GRUPPE as alternatives to these traditional gold and silver inks. These inks
contain no copper or zinc.
The special pigments used are fine aluminum flakes produced by evaporating aluminum onto a
carrier film, then dissolving the aluminum coating (approx. 1 /200 mm thick).
This complex manufacturing process is extraordinarily cost-intensive, and ultimately responsible
for the very high price of these products.
CORONA® Gold 46 G 1940 (one-component ink)
Thanks to a special process, it is now possible to incorporate these new pigments into offset
binding medium, resulting in offset-capable, heavy-metal-free gold printing inks. The very
smooth and highly reflective surface of the aluminum particles gives these inks outstanding
brilliancy and very good hiding power. Because the particles are so fine, pigment content can be
reduced compared with conventional gold printing inks, which further reduces waste-water
contamination, for example when lye-washing labels.
Because of the much lower film thickness that are transferred, the offset process cannot be
expected to produce the metallic effects achieved with gravure.
Printability
Based on experience to date, the printability of CORONA Gold can be considered at least
equivalent to conventional gold printing inks.
Colors
Colors such as Rich Gold, Pale Gold, etc. cannot be produced with CORONA Gold because of
the different pigment basis. Ink pigment shading reduces the brilliancy of the aluminum particles,
which is why only a low concentration of selected color pigments can be used in CORONA Gold.
Varnishability
With conventional gold and silver printing inks, difficulties always occur with the tape pull-off
resistance
of varnished prints. This is primarily due to the high pigment content and the fact that
cohesion within the ink film is therefore less than optimal. Tests conducted to date indicate that
given the lower pigment content of CORONA Gold, such problems are unlikely to occur.
Corona® Silver 46 G 1760 (one-component ink)
The formula for CORONA Silver is similar to that of CORONA Gold. It contains only special
aluminum
pigment, with no color pigments. Advantages over conventional silver printing inks
include
first of all its greatly reduced aluminum pigment concentration, with the accompanying
decrease in waste-water contamination in applications such as labels. A substantial increase in brilliancy
compared with conventional silver printing inks in another noteworthy feature.
