How to solve the problem of color difference when repainting furniture?

I. Causes of Color Difference
Raw material differences
There may be slight color variations among different batches of paint. Even if they are from the same brand and model, the color may still differ due to factors such as production time and storage conditions. Moreover, the material of the furniture itself can also affect the color. For instance, the texture and density of wood vary, and the absorption of paint by wood also differs, resulting in color differences after touch-up painting.

Environmental factors
Lighting conditions are one of the important factors affecting color perception. Furniture colors may appear differently under varying light intensities and angles. Additionally, environmental factors such as temperature and humidity can also influence the drying speed and color stability of paint, leading to color differences.

Construction techniques
The construction techniques during touch-up painting also have a significant impact on color differences. If the thickness and uniformity of the spray are inconsistent, or if the base coat and top coat are not properly matched, color differences may occur. Moreover, the technical proficiency and experience of the painters can also affect the touch-up painting results.

II. Methods to Solve Color Difference Problems
Selecting appropriate paint
Before touch-up painting, we should choose high-quality and stable paint. At the same time, we should select the paint type and color that match the original furniture's color based on its original color and material. We can compare different brands and models of paint using a color difference meter to choose the one with the closest color.

Controlling the construction environment
To reduce the influence of environmental factors on color perception, we should carry out touch-up painting under suitable temperature, humidity, and lighting conditions. We can use humidifiers, air conditioners, etc. to adjust the humidity and temperature of the environment, and avoid direct sunlight and strong light exposure.

Strict construction techniques
During touch-up painting, we should operate strictly in accordance with the construction techniques requirements. We should control the thickness, uniformity, and drying time of the spray to ensure that the paint can fully dry and cure. At the same time, we should pay attention to the pressure and angle of the spray gun to avoid problems such as sagging and bubbling.

Using a color difference meter for adjustment
During touch-up painting, we can regularly use a color difference meter to measure the color and make adjustments based on the measurement results. A color difference meter is a specialized instrument used to measure color differences. It can measure the X, Y, and Z tristimulus values of the color and then calculate the color difference between the two colors. If the color difference is large, we can appropriately increase or decrease the proportion of pigments or adjust the amount of thinner to achieve a satisfactory effect.

III. Notes
Before performing the re-painting of furniture, it is advisable to conduct a trial on an inconspicuous part first to ensure that the color and effect of the paint meet the requirements.
During the construction process, safety should be paid attention to. Protective equipment should be worn to avoid damage to the body caused by the paint.

After re-painting the furniture, appropriate maintenance should be carried out to prevent the influence of environmental factors such as direct sunlight and humidity on the paint, thereby prolonging the service life of the furniture.

In conclusion, the color difference problem in furniture touch-up painting can be solved by choosing appropriate paints, controlling the construction environment, strictly adhering to construction techniques, and adjusting through color difference meters. As long as we pay attention to every step carefully, we can restore the furniture to its original condition and add more beauty to our lives.