It is likely that the woodwork has been finished using an oil-based paint. The solvent based alkyd binder (synthetic polyester resins), drying additives and the natural oil in the paint reacts with oxygen in the air as it dries and hardens and may turn yellow as the coat ages.
If a tide mark isn't visible, yellowish-brown damp stains may appear along the skirting board. This is typically another sign of the moisture within the walls evaporating.
One of the best is to simply use a solution of warm water and washing up liquid, wiping off what you can with a sponge, cloth or scourer before drying the surface off with an old cloth or kitchen roll. You can then use a mixture of one part white vinegar mixed with one part water, spraying it onto the skirting boards.
This occurs when the pigments, tannins and other resins in timber are exposed to air and UV light. Over time this will cause yellowing in light timbers, while darker timbers usually develop rich brown or pink red tones and uncoated timbers will grey or silver.
Yellow Drips Can Be a Sign of Mildew
Mineral deposits and highly humid conditions are fertile ground for mold and mildew to grow. This means that, over time, the white streaks on your walls may begin to look more like yellow drips of mildew. You may not even notice white streaks at all before the mildew begins to form.
Leaking or burst pipes are the most common causes of visible yellow water damage on your ceiling. Over time, water from a leaking pipe can seep into the porous surface of your ceiling and cause significant water damage there.
Initially, sap sweats out of rafters in liquid droplets that can range in color from yellow to a dark red or amber. If not caught early, sap can harden and crystallize. Wood sap can hang from rafters in a long drop that resembles a long tear drop.
You are looking at tree sap. It's harmless. It's dried out so if it's gonna cause you to lose sleep at night, just scrape it off with a chisel. Sap is also known as pitch, at least for the softwoods that house framing is made from normally.
In a small bowl, mix equal parts vinegar and olive oil. Apply the mixture to the water stain using a cloth. Wipe in the direction of the wood grain until the stain is gone. The vinegar will help remove the stain while the olive oil acts as a furniture polish.
A damp skirting board is very often the result of whats known as 'rising damp'. Rising damp is damp that has risen from the ground through your walls. As it hits the skirting board, you'll notice those tell-tale signs of damp stains, peeling paint-and possibly even damaged plaster.
Damp and mould is often the result of water vapour condensation on cold surfaces. This type of mould looks like “black spots” and is typically found in corners, behind furniture, along skirting boards or ceiling edges.
Skirting boards that have begun to rot often indicate a rising damp issue. However, they don't need to be rotting significantly for you to have a problem. Sometimes, they may simply crumble easily under pressure. There are also instances in which they may have be merely cracked.
Oxidation, nicotine, grease, bleach, sun exposure, improper rinsing, not using enough detergent, and aluminum-based deodorant can all cause yellow stains on clothing and linens. If you do not wash your clothing correctly, any chemicals or particles in the fabric will start to decompose and break down the fibers.
Hydrogen Peroxide and Water – Mix ¼ cup of each, soak the clothes for 45 minutes, wash in cold water and hang to dry. Baking Soda, Hydrogen Peroxide, and Water – Mix equal parts of each, apply to the affected area, and rub using a bristle brush. After 30 mins to an hour, wash thoroughly.
Mix equal parts ammonia and water and pour it over the yellowish stain to soak. Let it dry or until the shirt is washed. Without ammonia, hydrogen peroxide can be used instead.
When wood is cut from the tree, the sap no longer runs as it did in the living wood. Lumber that has been kiln dried has had the sap heated to crystallization. From time to time, changes in humidity or temperature may cause cut boards to ooze sap.
Wood sap on rafters can exist in different forms. Ambering starts with liquid drops leaking out of the beams . The liquid droplets range in color from dark red, amber to different shades of yellow. Over time the sap may harden and crystallize in the shape of a tear drop.
One of the first signs of water damage is often discoloration. As moisture seeps into the walls or window sills it often causes yellow, brown, or copper stains. It might fade with sun or rain, or the stain might be permanent and only get bigger over time.
A yellow stain coming through white paint, or any color stain coming through any color of paint, is called bleed through.
Different environmental factors can speed up the yellowing process. This includes excess moisture, cigarette smoke, and cooking grease. Quick fixes such as using your overhead kitchen fan and avoiding smoking indoors can slow, if not prevent, white paint from yellowing.
That 'yellow stuff' is called lichen and it's created when algae and fungi reproduce with each other. Yes, you should have it removed. Lichen may cause damage to your roof; if left untreated, your roof might need to be replaced sooner than expected.
If you see paint bubbling, drywall swelling, or brown rings forming in your ceiling, then you know there's a leak you need to repair. However, before anything gets fixed, you first need to prevent the water from spreading and causing further damage.
Slightly discolored spots -- usually copper, yellow, or brown. Peeling, cracking, or bubbling wall surfaces. Discolored growths. Odors indicative of mold or mildew.