Difference types of stains used in temporary mount.
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Answers
Answer:
Methylene blue,safranin are two types of dyes used
Explanation:
Oil Stain
Oil stains are the most widely available and the type of stain most people think of when they think of stain. These are the easiest to use because the linseed oil (sometimes a mixture of linseed oil and varnish) binder allows plenty of time to remove the excess before the stain dries—even on large projects.
You can identify oil stains by their thinning and clean-up solvent: mineral spirits (paint thinner).
Though some oil stains contain only pigment, many contain pigment and dye and some contain
Varnish Stain
Varnish stains resemble oil stains in every way but one. Varnish stains use only varnish (sometimes polyurethane varnish) as the binder, so varnish stains dry hard while oil stains don’t. Therefore, a varnish stain can be brushed on wood and left to dry without wiping while excess oil stain has to be wiped off or the finish applied on top may chip or peel.
Think of a varnish stain as alkyd paint with less colorant added
Varnish stains are more difficult to use
Choose a varnish stain to overcoat an already stained and finished surface that is dull or scuffed, or if you’re wiping off excess on a small project.
Water-Based Stain
Water-based stains use water-based finish as the binder and replace most of the organic thinner with water. So these stains pollute less, are less irritating to be around, and are easier to clean up than oil or varnish stains.
To raise the grain first, wet the wood with a wet cloth. Let the wood dry overnight or at least for a few hours in a warm, dry room. Then sand off the roughness and apply the stain. To bury raised grain, simply apply the first coat of finish over the stain and raised grain, then sand smooth.
Overcoming fast drying is more difficult. You can add a slow evaporating solvent (usually propylene glycol) provided by some manufacturers, or you can add lacquer retarder. But adding either reduces the color intensity of the stain and defeats the main purpose of using water-based products in the first place—to reduce exposure to solvents.
Choose a water-based stain for use under a water-based finish.
Gel Stain
Most gel stains are oil-based, so they thin and clean up with mineral spirits. They are identifiable by their thickness, which is similar to mayonnaise. This makes them rather messy to apply, but gel stains solve the single biggest problem in wood finishing—blotching on pine.
Blotching is uneven coloring caused by varying densities and resin deposits in the wood and is the only problem that can’t be fixed by stripping and starting over. The only ways to remove blotching are to sand it out, which is very time consuming, or paint the wood, which is seldom a desired solution.
Lacquer Stain
Lacquer stains use very fast drying binders and solvents. Professional finishers love these stains because the finish can be applied within 15 minutes or so, and the stain can be added to lacquer to make a “toner” for adjusting color between coats of finish. It’s probably this use that has given these stains their name because they don’t use lacquer as the binder. They use a very fast drying varnish—a short-oil varn
Water-Soluble Dye Stain
Water-soluble dyes are sold in powder form, which makes them easy to identify. These dyes are also referred to as “aniline” dyes and were developed in the late nineteenth century for use on textiles and then adapted for wood. They were very popular in the furniture industry until the 1950s when metal-complex dyes were developed, and they continue to be popular with amateur and small-shop woodworkers because of their richness, wide choice of colors and ease of use.
To make a liquid dye from the powder, simply dissolve it in water. The ratio of one ounce of powder in one quart of water usually makes a standard color, but you can dissolve more or less powder to create a more or less intense color. The hotter the water the more powder you can dissolve. Use distilled water if there’s so much metal residue in your tap water that it affects the color.
The dye has an infinite shelf life in both powder and liquid forms.
Water-soluble dyes have two great advantages and one disadvantage when compared to the stains
The problem with dye is that it fades i
Metal-Complex (Metalized) Dye Stain
A weakness of dye is that it fades fairly quickly in UV light, so a more fade-resistant dye was developed in the 1950s called “metal-complex,” or “metalized” dye. This dye still fades, just not as rapidly.
Metalized dyes are usually available thinned with acetone (methanol was once used) and ready to use. These dyes are labeled “non-grain-raising” or “NGR” and are very popular in industry
Metalized dyes are also available in concentrated liquid form