In the comparison of hardness between Jujube Wood and Sour Jujube Wood, Jujube Wood generally exhibits higher hardness. This is due to the natural aging process that Sour Jujube Wood undergoes, which hardens the wood. According to the Janka hardness scale, Jujube Wood typically ranges from 1,050 to 1,250 pounds per square inch (psi), while Sour Jujube Wood can range from 1,200 to 1,500 psi. The aging process increases the density and hardness of Sour Jujube Wood, making it more resistant to wear and tear. This difference in hardness is attributed to the chemical changes that occur during the souring process, which include the conversion of starches into sugars and the hardening of the wood fibers. These changes enhance the wood's structural integrity and durability, making Sour Jujube Wood a preferred choice for applications requiring high strength and resistance to environmental factors.