Please characterize the differences between dye and chemical stains.
Dyeing stains give the wood a natural color, simply soaking into its structure. Chemical stains, on the other hand, cause a color change as a result of chemical reactions with substances contained in the wood and/or a suitable pre-treatment.
After staining with color stains, the final shade is visible immediately, in the case of chemical stains - it develops only after some time.
Coloring stains imitate the negative drawing of wood, i.e. initially lighter areas of the wood become darker due to stronger soaking of these places. Chemically stained wood, on the other hand, retains the positive grain pattern, so brighter places remain bright, and darker darker. Dye stains are easier to use than chemical stains.
What are double stains?
Double stains are chemical stains, consisting of a pre-stain – containing tannins or similar compounds -i from the stain, containing bases and/or metals.
What are developer stains?
Development stains are chemical stains. The color tone develops gradually in the wood only after the application of these stains, that is why they are called developing stains.
Combination stains can only be used on wood containing a lot of tannins. Please justify this claim.
Combination stains consist of chemical and dye stains. Because in this case no pre-drying is used, the chemical stains contained in the preparation can only work then, when the wood contains a significant amount of its own tannins. Oak is one of the wood species rich in tannins.