Baking powder is not entirely bio-based, as it is typically made from a combination of sodium bicarbonate (baking soda), cream of tartar, and a moisture-absorbing agent such as cornstarch. While some of these ingredients may be derived from natural sources, the overall production process and ingredients used may not be considered entirely environmentally sustainable. Additionally, the packaging and transportation of baking powder can also contribute to its overall environmental impact. However, there are bio-based and environmentally sustainable alternatives to traditional baking powder, such as using homemade baking powder made from natural ingredients like baking soda and cream of tartar. **

Chrome alum can be purchased at various online retailers such as Amazon, eBay, and specialty chemical suppliers. It may also be available at local craft stores, art supply stores, or specialty chemical stores. Additionally, some pharmacies or drugstores may carry chrome alum as well. **

Baking powder is a chemical leavening agent that typically contains a combination of bicarbonate of soda, an acid, and a moisture-absorbing agent. While some baking powders may contain bio-based ingredients, such as cream of tartar as the acid component, the overall product is not considered entirely bio-based. In terms of environmental friendliness, baking powder is generally safe for the environment when used in moderation, as it breaks down into harmless substances during baking. However, excessive use of baking powder can contribute to sodium levels in waterways, which may have negative environmental impacts. **

Alum is not necessary for lilac-red hydrangeas. The color of hydrangea flowers is determined by the pH level of the soil. For lilac-red hydrangeas, the soil should be slightly acidic with a pH level of around 5.5 to 6.5. Adding alum to the soil can lower the pH level and help achieve the desired color, but it is not necessary if the soil already has the appropriate pH level. Regularly testing and adjusting the soil pH is the key to achieving the desired color for hydrangeas. **

Pure chrome alum can be purchased from chemical supply companies, specialty online retailers, or scientific equipment suppliers. It is important to ensure that the source is reputable and provides high-quality, pure chrome alum. Additionally, it may also be available at some local specialty stores that cater to artists, craftsmen, or scientific researchers. **

Alum belongs to the class of substances known as double salts. These salts are formed when two different salts are crystallized together, typically involving a combination of an alkali metal sulfate and an aluminum sulfate. Alum is commonly used in various industrial and household applications, including as a mordant in dyeing, in water purification, and in pickling. **

To make crystals using alum, start by creating a supersaturated solution of alum by dissolving alum powder in hot water. Stir the solution until no more alum can dissolve. Then, pour the solution into a clean container and suspend a seed crystal (a small piece of alum) in the solution using a string or fishing line. As the solution cools, the alum molecules will come together and form crystals around the seed crystal. After a few days, carefully remove the crystals from the solution and allow them to dry. **

The reaction equation of clay with alum is as follows: Al2(SO4)3 + 2Al(OH)3 + 8H2O → 2Al(OH)4 + 3H2SO4 In this reaction, aluminum sulfate (Al2(SO4)3) reacts with aluminum hydroxide (Al(OH)3) in the presence of water to form aluminum hydroxide (Al(OH)4) and sulfuric acid (H2SO4). This reaction is commonly used in the process of clarifying water by removing impurities and suspended particles. **