Sinikuki

Sinikuki is a Finnish term often translated as "blue stain" or "blue mold." It refers to a type of fungal growth that can affect wood, particularly lumber and timber. This discoloration is caused by various species of fungi, most commonly from the *Aspergillus* and *Penicillium* genera.

The blue color is a result of the pigments produced by the fungi as they colonize the surface layers of the wood. Sinikuki does not typically degrade the structural integrity of the wood significantly, unlike some other wood-decaying fungi. However, it can affect the aesthetic appearance, making the wood unsuitable for certain applications where visual appeal is important.

Factors that promote sinikuki growth include moisture, moderate temperatures, and the presence of nutrients in the wood. It is often seen in wood that has been stored improperly, especially in damp conditions, or in wood that has not been adequately dried. Treatment for sinikuki usually involves removing the affected surface layer or applying fungicidal treatments. Prevention is key and involves proper wood drying, storage in well-ventilated and dry areas, and sometimes the use of protective coatings.