What is blue stain, you see it in lumber but what is it. Blue stain comes from microscopic fungi that is commonly found in sapwood of various trees, for example pine comes to mind but you can also find it in others species as well. Fungi use different parts of the sapwood including simple starches and sugars found in trees for food. Fungi can cause a blue colour in lumber but doesn’t have to be blue, depending on the species of fungi and how much moisture is found in wood it can be different colours from blue to bluish black to Gray. Blue stain spores are sticky and are spread around by wind and insects transferring the fungi to the trees.
Blue stain does not effect the strength of lumber, lumber with blue stain is just as strong as lumber that does not. Blue stain will not rot lumber or decay the lumber in any way, Blue stain is not mold, some people can make the mistake thinking that blue stain is mold but it’s not. blue stain is harmless and can be handle in the same
way as lumber without blue stain but mold on the other hand is quite harmful to your
health, it needs moisture to grow, it does not grow in dry areas, mold in side your home
can he a hazard. Mold can rot wood and do damage. Mold also stains and discolours so it’s no wonder why sometimes people mistake blue stain for mold. Mold also smells, if you can smell a musty or an earthy smell it maybe a precursor to mold. Mold can be any colour but if you place a bit of household bleach on the area and if it loses it’s colour or disappears all together it’s likely mold, if the area you’re testing does not lose it’s colour or disappear it’s likely not to be mold. If you find blue stain in your baby barn, don’t worry about it, it’s harmless.