ᐅ My KALLAX unit shows different shades of color after each window replacement – why is that?

Hello everyone, I have a somewhat unusual problem with my KALLAX shelving unit that I haven’t encountered before. Whenever I swap or move different compartments or module sections, I notice that the color shades of the surfaces change—not just slightly, but visibly noticeably—even though they are supposedly identical items.

My question to the community: What could be the reason that my KALLAX unit shows different color shades each time I change a compartment or shelf? Could this be related to manufacturing processes, storage, lighting conditions, or material properties? I could imagine there might be different production batches, but such significant differences seem unusual for furniture that is otherwise identical. I’m interested to hear your feedback, possible explanations, or similar experiences.

Sehanni64 schrieb:
My question to the community: What could be the reason why my KALLAX unit shows different shades of color after each window replacement (replacement of compartments or shelves)?

Hello, your issue is quite understandable. Differences in color shades can actually have several causes that go beyond simple optical illusions. First of all: KALLAX units are produced in batches. It can happen that different production runs show slight color variations, especially with melamine-coated particle boards or similar materials.

Storage also plays a role. If some units or shelves have been exposed to light or moisture for extended periods, the surface can sometimes change color slightly—so-called aging effects. Combined with ambient room lighting, such as daylight from different angles, this can significantly affect the perception of color shades.

Therefore, I also ask: Did you purchase and install the units at the same time, or were they reordered or replaced at different times? If the latter, different batches are very likely.

One more tip: If color consistency is particularly important to you, it is sometimes worth buying entire sets at once. Individual reorders are often the cause of unexpected color deviations, especially if production or material suppliers have changed in the meantime.

TEBILO schrieb:
KALLAX units are produced in batches. As a result, slight color variations can occur between different production runs.

Additionally, I want to clarify that the melamine-coated particle boards used may also come from manufacturer pallets with slight tint variations. These color differences stem from production conditions at coating facilities, which vary somewhat with each batch: temperature, pressure, drying time, and pigment composition all play a crucial role.

Sehanni64 schrieb:
Could this be related to manufacturing processes, storage, lighting conditions, or material properties?

Storage should not be underestimated either. Especially UV exposure near windows can lead to slight fading or surface markings, which vary depending on the location within the home. Furthermore, surface reflections at different viewing angles and light sources (incandescent or LED lighting) significantly influence the perceived color.

My recommendation: Try to evaluate the units under as consistent lighting conditions as possible and avoid frequently swapping individual compartments to minimize the effect. For mixed orders with variations, you could arrange the most noticeably different units in less visible positions.

usbla schrieb:
The color differences result from the production conditions at coating facilities, which vary slightly with each batch.

Interesting point – however, I question whether that alone can explain the clearly visible color differences in a KALLAX unit. IKEA is well known for strict quality controls. If such significant color variations do occur, one might assume that the units either come from different production plants or are returns or second-quality goods.

TEBILO schrieb:
Did you purchase the units at the same time and install them immediately, or were they reordered or replaced at different times?

This distinction seems crucial to me. If you buy individual pieces later, with several months or even years in between, color variations due to changes in production methods or supply are indeed more likely.

Regarding storage: I also consider this relevant. Even ambient humidity and temperature can slightly affect the surface color and texture of wood-based materials. I would suggest checking again precisely when the units were purchased and whether they effectively come from the same production batch. Only then can the “window swap” phenomenon be reasonably explained here.