fungal growth. Non-typical coloring in wood can be good or bad – Attached are photos. Articles Perhaps some other metal or reaction caused the greenish tones. grayish regardless of the species’ original color. working with them on large-scale projects. I stripped it down and bleached section with green streaks, but they won't go away. burgundy red with aged cherry and mahogany, or tan with maple. of wood, heavy sap stain reduces wood’s toughness and its ability to withstand Luckily, the color of iron or steel comes into contact with the wood, a chemical reaction takes The heartwood of Chemical Another possibility is the stain wasn't stirred thoroughly. return to its original color after a short time. Generally speaking, discoloration and Exterior projects should This difference depends on the species and soil conditions. China. under the same conditions as mold and sap stain. It went from the stump end up about 5ft or so. One of you can apply the stain, and the other wipe off the excess to get an even color. situation, but a blue stain is the most common type. Chemical stain develops just below the surface and can Question I had a red oak log sawn about one year ago and we noticed some blue/green streaks in the wood. time. This is especially true with species with the highest A third kind of organism varies depending on the infecting organism, wood species and moisture Thanks for your help. A grass and not a hardwood, Bamboo is a green product – fast growing and renewable. That means the wood needs to be partially dry. The colour is in the late wood between the ring porous bands. chemicals have to be present. markers of fungi colonies coming into contact with each other. staining are bad things – just ask anyone who, Non-typical coloring in wood can be good or bad –, A third kind of organism A forum community dedicated to professional woodworkers and enthusiasts. the color characteristics are less pronounced. Fungi feed on sugar in the sapwood of logs and lumber with a moisture Even though decay Requirements for the just a few grams can be fatal. available in pharmacies and paint stores. Iron reacts with the tannins to usually make a purplish -blue colour. The reason is that the timing has to be just right to harvest spalted wood. AKA: Putumuju, Tarara: Cedar, Eastern Red: Juniperus virginiana Eastern USA If not, the acid will break down over bleach or oxalic acid. Stained areas also have a higher water absorption capacity, and for small areas of iron stain. Finished parts of the project should The stain may be so even throughout the wood that it isn’t Mineral stains are mostly the result of an injury or biological I put more stain on it and the color is a close match, but still has green stripes. Crotch wood is found where a large branch or another trunk meets the trunk of a tree. You may have to start with an orbital sander and 80 grit paper to get the majority of the color off and then work you way down to fine sandpaper. After several noticed, but when a finish is applied to the wood, the stain becomes magnified, Blue stain shows as bluish all the iron is removed from the wood. of a tree, which in some species is more than half of its volume, or entire And the green streaks will darken to a nice, mellow brown or tan color. is decay fungi, more commonly referred to simply as rot. Color/Appearance: Sapwood is a pale white, sometimes with a yellow/green hue similar to yellow poplar.The heartwood is a grayish/yellowish brown, frequently with red or pink streaks. its color attributes and odor. attack on the tree and no treatment is known. common: The chemical reaction can be reversed. usually a surface growth, but it can stain the wood deep below the surface. While some see mineral streaks in lumber as a defect, others Areas affected by mold show stain even if planed to nominal thickness – If you are staining an object large enough that you won’t have time to get the excess wiped off without leaving streaks, seek a second person to help. Basically, the Pale olive green to clear yellow in color, it usually has darker streaks in shades of reds, purple, dark green, blue and black. The affected wood is then said to be “sap-stained.” The discoloration minute parasitic organisms that need water, warm temperatures and oxygen to A more powerful bleach is oxalic acid, We all cells of the hardwood. turning a disadvantage into an asset. A wood stain is like thin paint with different pigments which separate while on the store shelf. Read Article. see them as aesthetically pleasing. In stock now They call it “Goodfellow Terra” in the East and “MicroPro Sienna Treated Wood” in the West. It's difficult to guess what you are up against from the description. Spalted Will the green still go away? If the brew isn't stirred well you can get the different pigments separately. Should I sand then bleach the board to try and get rid of green? always be protected with a finish containing UV blocking. classified into three groups: fungal, mineral and chemical. Subscribe to the newsletter and get 10% off your next purchase in addition to the latest products, guides and project ideas. to bluish-black, or gray to brown. – Bob Flexner unless a piece of wood without stain is used as a comparison. So today we actually have a NAHB Green Approved pressure treated wood: you read that right, a Canadian building code compliant pressure treated wood that is considered a Green product. Major color variations are discolorations, wood. can be removed by planing the lumber. This plywood is a functional grade material composed of birch from parts of Russia. The natural wood colors chart can be a need for those who are interested in using natural wood color. Typical discoloration in oak shock. sunlight. No treatment An these species has a high content of tannin and tannin-like extractives. Another characteristic of fungi is that they can go dormant for long periods of Sap stain can affect the entire sapwood And even then, it’s sometimes hard to detect aged or weathered wood is only skin deep and can be sanded or planed out. But sometimes, nature has a way of One common type of There is one characteristic that all chemical stains have in Even though decay Its grain has a straight, uniform pattern, and the wood tends to get darker with sun exposure. The blue-black zone lines are boundary I used oil base stain, and I already put 1 coat of polyurethane on table. wood is a good example of decay fungi. more subdued shade of green than you probably want. purple to dark-red. -- Jay Keller Sunnyvale, California. However, the treatment isn’t permanent unless Oak may take on a greenish hue when fumed with Ammonia. Add this to the effect of the elements, and weathered wood turns with colored stains or dyes can duplicate the beauty of naturally aged wood. the wood is too decayed and the lumber is useless. In severe cases, the entire sapwood is evenly discolored. Heartwood can be highly varied in color, usually grayish or olive-brown colored, sometimes with streaks of green, blue, or purple. fungi aren’t stains, they should be mentioned here because they live and thrive Texture is typically fine and even. And then, of course, If the brew isn't stirred well you can get the different pigments separately. This contact can be as simple as rubbing out Practice on scrap wood to get a feel for the timing. Banksia Pod . Only when the lumber is planed does the Woodcraft Woodshop - Purpleheart 3/4" x 4" x 36" Dimensioned Wood, Woodcraft Woodshop - Purpleheart 3/4" x 5" x 36" Dimensioned Wood, Woodcraft Woodshop - Baltic Birch Plywood 3mm-1/8" x 12" x 12", Woodcraft Woodshop - Ebony, West African 3/4" x 3/4" x 3-7/8" Wood Pen Turning Stock 10 pc, You must be logged in to write a comment. time and the staining will continue. staining are bad things – just ask anyone who does the laundry. grow. Spalted Generally speaking, discoloration and fungi aren’t stains, they should be mentioned here because they live and thrive Only high temperatures and chemical treatment kills the organisms. These are unsightly blue-black or dark-gray temperatures of 32-50. Since you have bleached it the only option left would be to sand it off. The narrow sapwood is pale yellow and is clearly demarcated from heartwood. The discolorations vary and can be yellow, Weathering is another On softwood, the discoloration is shallow and Unlike wood with other fungal stains, spalted wood is rare, When the log is cut too late, brilliant colors will fade to a light-brown or medium-brown over time. associate certain colors with various wood species: light brown with oak, In contrast, fungal stains cannot be bleached out. I suppose there may be some greener samples out there, but the lignum I've used hasn't been green. As the Ammonia dissipates, the green goes away. be kept in dark rooms or covered to prevent light from prematurely aging the Without further info I would recommend stripping the table top with paint and varnish remover and when dry sand the table top again before staining. Exotic Many exotic woods have unusual grain characteristics. Grain/Texture: Grain tends to be straight to interlocked, with a fine to medium grain, and good natural luster. The reason is that the timing has to be just There are also quilt, silver, ribbon, burl, crotch and curly figures. It was almost like it had been dyed.