The N.G.R stain (non grain raising stain).
The N.G.R. stain (non grain raising stain) is already widely known and used in wood finishing industry. This stain is easy to be used and handled with satisfactory results in the wood finishing industry. The N.G.R. stain is also relatively easy to be mixed and self-made by the finishing peoples. The N.G.R. stain is made from organic pigment that is very easily to be dissolved and mixed perfectly without any binder as the inorganic pigment stain. The N.G.R. stain is actually quite easy to be bought and obtained from the suppliers of finishing material. Many finishing material provide the N.G..R stains with quite complete color catalog. If we purchase the N.G.R. stain in a large and continuous quantity, some suppliers are willing to mixing the stain with the special color according the color finish we need.
However, many finishing peoples often choose to mix and make the stain themselves. We, as finishing peoples of course cannot mixing the stain as in the finishing materials manufacturer which has more sophisticated equipment, but as the user we can mix the stain according to our need. We can make the stain in proper amount and do some adjustment according to the application condition.
Here is the process of making the N.G.R. stain.
- The materials required.
Meanwhile the main thinner used to make the N.G.R. stain is alcohol. The mostly used is the denatured alcohol since it quite inexpensive and easy to be obtained. We may add some solvent to adjust the stain properties. For example, ethyl glycol can be added to the mix to make the stain becomes longer dry so can be more wetting the wood stain.
- The tools required.
- Mixing the stain.
Pigment in the liquid form is easier to be mixed than the pigment in powder form, since that solve the pigment powder in the thinner to form a concentrated liquid pigment. Mixed all the powder in the thinner in a certain ratio then placed in a measuring glass.
Then fill the pigment concentrate on the thinner one by one and little by little to obtain the required stain color. Agitate the mixture when we do mixing. We need to check the color every time we add some more pigment or thinner. To check the color stain we need a standard stain color. Pour down the stain we make and the stain standard side by side on tile, card or a piece of wood and viewed. (See our previous article: How to check the stain color).
Usually we need several time of pigment and thinner addition to find the right stain color. We can use the color triangle diagram or color wheel diagram as a tool to mixing the color.
Sometime the dye powder leaves some solid particles or even little slurry in the mix. If it is happened then we need to filter the mixture to obtain a clean and mixed well stain.
Here are the things that need to be considered in making N.G.R. stain.
- Make sure the materials are well mixed for each other.
- Always do a test first before doing the mixing in large numbers.
- Make recording about what we have done.