" " wisno wood furniture finishing: Inorganic pigment stain

Friday, October 15, 2010

Inorganic pigment stain

Inorganic pigment.

Inorganic pigmented stain is a stain that uses a mixture of inorganic pigments to form its color. Inorganic pigments are made from mineral that are grounded to a certain subtlety. Minerals that have a certain delicacy is then mixed with a resin as a binder and then dissolved in a solvent to be used as stain. Some inorganic pigments are widely used in wood finishing industry are: titanium white, carbon black, chromate yellow, red oxide, burnt siena, raw umber, van dyke brown, etc.
The inorganic pigments have different properties; overall he has higher cover ability, less bright and less transparent than the dye pigment  (the stain for wood finishing) The particles of the inorganic pigment are relatively large size so it can not form a solution as the dye stain but merely a suspension. The pigment will settle after it is left for awhile. A consistent agitation is required at its application to produce a stable coloration.
Compared with aniline dyes or inorganic pigments are relative more stable and have better durability against the UV light make it more resistant for outdoor finish applications.
There are many stain colors available for this type of stain, but as well as organic pigments we can also make our own stain color by mixing from the primary colors. How to color mixing is done by using the principle of the color triangle. But when we mix the color we need to sure that we never mix the inorganic pigment with the organic pigment and vice versa. The mixing of  different type of pigment will result unstable color stain.
There are several type of the inorganic stain that mainly are determined by the binder used.
  • Pigmented wood stain (inorganic pigmented wood stain)
This stain is a wood stain that uses the colorant from the inorganic pigment. This stain is made from a mixture of inorganic pigment, some binder and solvent. This stain is usually applied directly on wood surfaces. This stain produces a duller, less transparent and less bright than the aniline dye stain. Therefore, this stain more suited to do the finishing with more soft and less bright color. Stain for even the color such as: sap stains and equalizer stains should be made of inorganic pigment. The inorganic pigment which has a more cover ability is more suitable to cover the uneven color in the wood substrate and bring it to more even color result.
There are many names used for this stain but the stain can be distinguished from the dye stain from its dull, less bright appearance.  This stain also will have sediment after it is left in place for some time.
Application by spray is the most widely used for this stain. By spraying the stain can be applied with a thickness can adjusted accordance with the desired color. A slow dry solvent type such as mineral spirits can also be added to the mix this stain so it can be applied by brushing or wiping. But the application by brush or wiping with this stain is difficult to produce dark color. The relative big pigment particles make it can not be absorbed by the wood. The stain will only coat the surface so it will be easily erased at the wiping or brushing operation.

  • Glaze.
Glaze is one type of stain that uses inorganic pigments. The inorganic pigments are mixed with some resin binder, some inert and solved in a solvent. Glaze is designed to be applied between the clear coatings. The binder and inert make the glaze is easy to applied in certain thickness on the clear coating. More about glaze can be viewed in our previous article: glaze in furniture finishing
  • Base coat, enamel, paint.
It is a stain to make solid color finish. This stain is made from inorganic pigment mixed with a clear coating as binder.  There are many types of this paint depends on the type of binder used. Many color of NC base coat, water based base coat, PU base coat and many other base coats are available now, which all can be selected in accordance with the finishing system used.

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