Size (length*width*height): 6cm x 6cm x 8cm

Origin: Local

Material: Powder

Tannic acid is a naturally occurring plant. Nowadays, tannic acid is applied topically for the treatment of cold sores, diaper rash, fever blisters.
Although certain aquarium chemicals contain tannic acid, most fish hobbyists encounter the compound from adding driftwood into their tanks. When placed in water, the driftwood begins releasing tannins into that water.

Tannic acid is in a class of chemicals called tannins, which are found in many plants. Tannic acid refers to tannins that can be dissolved in water, as opposed to the other type, or condensed tannins. According to Cornell University Department of Animal Science, tannins are a group of compounds known as plant polyphenols, which cause proteins to bind and form complexes. Tannins are found in many of the foods you eat, including fruits, teas, wine and edible grasses .

Water Color
Once driftwood leaches tannins into your aquarium, your water color likely will take on a yellowish-brown appearance. It often looks like weak tea. While water changes will change your water somewhat back to its normal color, the change is only temporary, as the driftwood will continue to release tannins. Over time, the amount of tannnis released diminishes and your water will return gradually to its nice, normal clear color.

Water PH And Hardness
Plop a piece of driftwood in your tank and test your pH a few days later. You may notice a slight drop in the alkinity and hardness of your water. That's because tannic acid reduces water pH and hardness.