Changing the Color of Natural Stones Using Nano Sized Natural Dye Colorant (NNDC)
Nature provides us rocks with a wide variety of colors. For the natural stones which are
used as decorative covering stones, the appearance is an essential parameter; to an extent that color
and textural characteristics determine the market value of natural stones in construction industry. In
this article, recent patents are discussed, which were used for dying natural stones, as, NNDC (nano
sized natural dye colorant) was used on some type of natural stones for decorative purposes. NNDC is
formed by mixing the plant and madder. NNDC solutions were prepared with fresh water. Therefore, NNDC is not harmful
for human health. The solutions facilitate the penetration of the dye into pores or other openings located in the stone.
Generally the dye cannot be easily removed or discolored. However, it may be removed by certain chemicals with extended
contact. For this purpose; the samples of marble, limestone, travertine and basalt were collected for changing the
color studies. This paper describes how the color of natural rock changes using NNDC. Desired colored rocks can be used
for decorative purposes. The economic value of the rocks can be increased by converting them to the desired color using
the NNDC. Method to be applied in order to be transferred to the structure of the rock for the use of color will not be of
any problem. In addition, to the needs of architecture, natural colored stone will be provided.
Keywords: Nano size, natural dye colorant, natural stones, physical properties, decorative stones.
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