It is used for chemical oxidation of the surfaces of iron-based alloy products containing no more than 3% chromium.
Volume, ml: 104 (3.5 oz) Enough for blueing 2-3 rifles.

        The solution forms on the surface of the metal a strong oxide film 5-10 microns thick, which reliably protects against corrosion due to the influence of atmospheric oxygen and moisture. Also, the film has sufficient mechanical strength and is resistant to scratches. The oxide coating does not lose its appearance even for decades. But at the same time, the process requires at least 6 hours to build up an oxide film of the required thickness, during which several processing cycles are carried out. It was the high labor-intensiveness of the process that led to its being replaced by the cheaper and faster, but lower-quality alkaline method. However, the blueing process with rusty varnish does not require the use of complex equipment and can be carried out at home.
This formulation of rusty varnish gives the most durable and beautiful bluing of all known means! Rusty varnish goes through several stages of cleaning, so during the bluing procedure, a minimal amount of plaque from reacted salts is released. This allows you to reduce the consumption of steel wool, simplifies the cutting procedure, and minimizes the amount of dust generated.

Brief instructions (detailed instructions are supplied in paper form together with the product)
1. Surface preparation - grinding, polishing.
2. Defatting. First with a solvent, then by boiling in a solution of soda ash.
2.1 Washing.
3. Applying the 1st layer
3.1 Drying of the 1st layer at room temperature. tempo.
3.2 Applying the 2nd layer
3.3 Drying of the 2nd layer
4. Boiling in distilled water for 10-15 minutes.
5. Scratching with steel wool, a metal brush.
6. Repeat points 3-5 about 5-7 times until you get a suitable coating.
7. Neutralization.
8. Warmed up in oil at a temperature of 105-130 °C

Sizes
Sizes are not more than: 17x11x5 cm (6.7x4.3x2 inches)
weight are not more than: 0.195 kg (7 oz)