This is common in homes with central air and heat. The reason for this line of gunk is because the carpet is acting like a giant air filter and the dust is getting trapped.
There are no perfect seals and when the air starts moving in your home, some of it can get trapped in the carpet. The only way for the air to escape is through those cracks along the wall where the baseboard meets the carpet. If carpets are firmly tucked below the baseboards, blocking collection of dust and grime, it results in the formation of black lines on them. However, some baseboards expand with temperature swings and humidity. For instance, MDF baseboards tend to expand and contract more with temperature swings, however tight the initial gap between the floor and the baseboard.
Santa Luzia baseboards on the other hand have a small thermal expansion coefficient and this feature helps reduce this effect. Santa Luzia baseboards are an ideal choice with carpet flooring especially in the swing states where the temperature fluctuations are extreme like Nevada, Montana, North Dakota, Idaho etc.
Color is often the hardest decision for customers buying carpet. It can be tough to visualize the color in a large space, judging from a tiny swatch. A color change can have a dramatic effect, and sometimes even though a change is desired, it can be a bit scary.
There is a reason why neutral colors are the biggest sellers in carpeting. Carpet has a big impact in a room, and bright color in a large expanse can be overpowering. Also, replacing the carpet is expensive. Unless you have the resources (and patience) to replace your carpet every few years as trends change, you are best to keep the color on the floor neutral. Use the brighter or bolder colors in other, less expensive elements of the room: paint on the walls (much easier and less costly to change than the carpeting), cushions on the sofa, bedding, and smaller accent pieces such as lamps and framed art. Or moldings and baseboards. Santa Luzia carries many dark colors to contrast the neutral color of the carpet to frame it and not to settle for the standard white baseboard.
But should you decide to opt for a darker color. Our color collection allows you to select from the standard white to colors such as glacial gray, minimum marine, black, copper, silver, gold etc.
Another great way to incorporate personality into your carpet is to choose a flecked color instead of a solid color. Technically speaking, these flecks of color in a carpet are known as Berber, even though most people use the term Berber to refer to a looped style of carpet. Typically, carpets with Berber flecks are found in neutral colors with darker neutrals used for the flecks.
In addition to being visually appealing, Berber flecks are quite practical, as they can help to hide any bits of dirt or lint that may be found on your carpet in between vacuuming sessions. You may want to consider a flecked color if you dread the thought of seeing anything out of place on your carpet.
Textured moldings could be a good match with Berber flecks, while a smooth white or black molding can also provide great contrast. Santa Luzia has many textured options among the baseboards. Metallic colors or rust colored baseboards can make your home stand out in unique ways. If you are a nature lover but want to save trees you can use our wood textured, wood-like moldings that come in the following varieties - ebony, silver oak and dark ipe. Here’s the link to browse through them.