Mar
Accessories, Decking, Service
Black spots on the terrace
Terraces are a place to relax and unwind in spring and summer. Unfortunately, black discoloration can form on some planks over time, which detracts from the overall appearance. What are the causes of these discolorations and how can they be removed?
Causes of black spots on the terrace
The black stains on the terrace can be caused by the so-called tannin oxidation reaction (also known as the iron-tannin reaction). This is a natural reaction that occurs when wood comes into contact with base metals such as iron. The tannins in the wood oxidize and cause the unsightly discoloration. The discoloration can vary from deep black to bluish black to greenish stains, depending on the type of wood and material input.
Removing the black stains on the terrace
Fortunately, there is a simple solution to remove the black stains on the terrace: oxalic acid. Oxalic acid is an organic acid that is found in many green plants, such as spinach or rhubarb, and dissolves discoloration on wooden surfaces. The oxalic acid is biodegradable. It is broken down in nature by various bacteria and fungi and is therefore an environmentally friendly alternative to other chemical cleaning agents, which is why Bettwood offers it as a patio cleaner in its online store. In addition to stains, a slippery biofilm after winter can also be easily removed with the patio cleaner. We have explained the best way to clean here: https://betterwood.de/beratung/terrassendielen/holzterrasse-reinigen/
Protect sensitive surfaces
Two things in particular should be taken into account when cleaning. Firstly, the use of high-pressure cleaners is an absolute no-go! The often too strong water jet not only loosens the wood fibers, but also opens and enlarges the surface of the wood, creating a breeding ground for moss and algae. The green sheen becomes increasingly difficult to remove over time and the wood is slowly damaged.
You should also be careful when using oxalic acid. Even if it is a diluted and weak acid, it is still an acid that requires protective clothing. In addition, care should be taken when sensitive surfaces are nearby, as oxalic acid can lead to oxidation stains that cannot be removed. Glass and metal surfaces in the visible area in particular should be masked against splashes before using oxalic acid.
Patio cleaner as a solution for black stains on the patio
Black stains on the patio are a common problem, but can be easily remedied with the help of oxalic acid. The tannin oxidation reaction is a natural reaction over which we have no influence. With the right cleaning, however, you can ensure that your patio shines again and that you can enjoy your time on it to the full.
