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Thelime putty obtained from river pebbles, it has a non-uniform, pleasantly velvety tone, similar to ancient surfaces and at the same time permeable to vapor, shiny and resistant over time. As long as it is lime putty aged naturally, in open-air holes, keeping the surface constantly moist to prevent drying, and then aged for at least 24 months.
A lime putty natural of this type is for example that used by the Harpo company in its Sandtex range of paints, stuccos and plasters for civil, environmental and geotechnical engineering. Ecological products for high-quality and eco-friendly finishes (even if the lime production cycle is quite energy-intensive) in full compliance with the Italian tradition in the construction of buildings which has always preferred plaster to lime putty to the use of exposed stone, of Anglo-Saxon tradition.
The lime putty used in construction is nothing more than calcium hydroxide (also called slaked lime or hydrated lime) in the form of colorless crystal or white powder produced by dry hydration of calcium oxide (also called lime or quicklime). In painting, slaked lime is indicated in different ways: white lime white, Florence white, slaked lime and Florence chalk.
The line of products based on lime putty Sandtex includes finishes ranging from paints to colored plasters, stuccos and marmorinos. Depending on the formulations of the lime putty different results can be obtained. For example, there is the 'antiqua' style characterized by smooth and consistent surfaces that enhance the color of the plaster; the 'spatula' effect that gives light to the wall; that 'nineteenth century' suitable for Renaissance style exteriors; the 'marble' effect that allows the material to be modeled with color and finally the 'sinopia' effect, a decorative coating for interiors with a velvety appearance.
The lime putty, whose raw material is made up of river pebbles, as mentioned, is a type of decoration used since ancient times. Today this type of processing is still available thanks to the passion and dedication of some professionals skilled in working with traditional processes and materials which, due to their architectural and environmental value (with reservations on the energy impact of production in the case of lime putty) become extraordinarily modern again.
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