, According to EU directive 89/107/EEC, tannic acid cannot be considered as a food additive and consequently does not hold an E number. xlv. In the United States, tannic acid is generally recognized as safe by the Food and Drug Administration for use in baked goods and baking mixes, alcoholic and non-alcoholic beverages, frozen dairy products, soft and hard candy, meat products, and rendered animal fat. We see shellac in our everyday lives. GreenWave Solutions is Atlanta’s First “Green” painting contractor. For simple applications such as interior painting on previously painted substrates, these products perform fine; but when getting into applications in a more demanding environment, they fall short. Tannic acid is a specific form of tannin, a type of polyphenol.Its weak acidity (pK a around 6) is due to the numerous phenol groups in the structure. The selling point is that “it requires fewer coats and products to finish the job so you save time and money.” While this sounds awesome, it is misleading. While tannic acid is a specific type of tannin (plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. Shellac-based primers are the best primers for sealing in stains. Tannic acid is a specific form of tannin, a type of polyphenol. Obviously if you have a condition which keeps re wetting the tannin paste some might bleed through. , Quercitannic acid was for a time a standard used to assess the phenolic content in spices, given as quercitannic acid equivalent.
I have heard horror stories of people applying 3, 4, and 5 coats to still have the knots bleeding through. On tannin-rich woods, the reaction can be instantaneous (Photo at right). What makes these primers such great sealers is the same thing that makes them ineffective primers for exterior house painting. Tannic acid can be applied to woods low in tannin so chemical stains that require tannin content will react.
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