[0001] The invention refers to a method to eliminate the stains onto the marble surfaces,
generally level, without shift said surfaces. This avoids the use of a smoothing mill
that, to eliminate the stain, works as far as the no eaten into layer with the actuation
of a subsequent buffing. Currently, infact, the stains that form onto the marble surfaces
for different causes are eliminated only actuating the removal of the plane and its
transport in a worker in marble workshop. In this seat the stain or the stains are
eliminated using specific machinery having the characteristic to eliminate all the
marble superficial layer, also the no stained parts, and then a buffing is actuated.
For surfaces not mobile, like floors or stairs, or surfaces not easy to be dismounted
machines to be transported are used that actuate the same working of the machines
present in the workshops. But these machines need skilled workers for their use and
also voltages generally not present in the house electric connection. Aim of the present
invention is to create a method to eliminate the stains onto the marble surface without
the necessity to remove the marble plane of the interested surface, without the use
of specific machinery and with workings to be actuated to persons not skilled in this
field. It is known that the stains formation is frequently due to the acid substances
or similar absorption. Infact, also only for having placed an ash-try with dirty under
border, for example dirty of fruitjuice or any other acid substance, onto a marble
plane , the absorption generated the stain. Also the presence of acid substances onto
a floor, onto a wall or onto stairs, if not immediately cleaned, generate stains to
be eliminated only with particular workings. In this situation the aesthetic damage
on these surfaces remains till the total buffing of the same surface is actuated with
high costs that justify said working only in the case of more stains or when the stains
and the wear and tear suggested the total sanding with abrasive and the subsequent
buffing. The invented method permits, instead, to actuate the immediate elimination
of the formed stain onto the marble and the reinstatement of the original lucid layer.
The advantages coming from the invented method so essentially consist in the fact
to eliminate the stain quickly and to not must use particular machinery and skilled
persons with the relative costs, this with a final result equal to the one obtained
with the workings known in the prior art and without removing the stained surface.
The invented method is following described in the particulars and in the drawings
of table 1 which show a working example. Figure 1 is perspective view of a component
used in the invented method. Figure 2 is transversal section view of a buffer to be
used with the mixture to be used for giving again to the marble the original polishing.
The invented method uses a polishing buffer 1 with under abrasive sheets 2, or part
with abrasive dust, and a second spongy buffer 3. Onto said spongy buffer 3 is placed
a mixture 4 consists of oxalic acid in grain 5 of a diameter from four millimetres
to eight millimetres and, in the same quantity, to this mixture is added other milled
oxalic acid 6 having a dimension smaller of the grains 5 but not in dust. This second
milled oxalic acid 6 has so the dimension of coarse sand. To all this mixture at the
end is added, in quantity like the middle of one of the two components already used,
a marble polishing dust 7, known in the art with commercial name "potè polishing dust".
This mixture, that to treat a corrosion stain left to something with a dimension of
a glass bottom, is composed of about ten grams of oxalic acid in grain, of about ten
grams of milled oxalic acid and of about five grams of polishing dust, is the fundamental
element to bring the marble to the original conditions. The working method provides
a first cleaning phase of the surface 8 to treat, using a neuter deterging distributed
with a spray, with subsequent rinsing with water by means of sponge and with drying
actuated with a felt cloth. After about a hour, with the marble surface dry so that
the stain of acid substance is visible, the abrasive polishing buffer 1 is used. The
stain to be eliminated is wet with a little quantity of water and so to form a water
thin layer covering the same stain. Indicatively for a stain left to a glass about
twenty-five grams of water are used, the abrasive polishing buffer 1 is used making
rotating movements onto the surface to be treated for about one minute. During the
action of the buffer onto the stain the water is coloured of the marble colour to
confirm the reactions of the material to the proceeding. After about a minute the
marble surface is cleaned with a dry cloth. In this phase the treated marble surface
must be opaque and uniform, with the sign of the stain. In the case that the stain
or part of the same are still present, the surface must be wet again with a thin layer
water and must be used again the abrasive polishing buffer 1 with the modes previous
described. Onto the opaque stain formed onto the treated marble is then placed, by
means of the spongy buffer 3, the mixture 4 adding a water drop. Then are actuated,
with strong wiping, circular movements onto the opaque part for about two minutes.
At the end of this working the marble surface is cleaned with a dry cloth, with the
corrosion stain not more present. In the case that opaque parts still are present,
is used again the mixture 4 by means of the spongy buffer 3 with the same modes and
so till the complete elimination of the opaque parts. To have a marble surface with
bigger lucidity is then used a marble polish without frustrate the invented polishing
method. The described method so eliminates the stains onto all kinds of marbles with
results equal to the particular known workings.
