Rubber Cup Lump Fresh latex is harvested by tapping into a long cut in a rubber tree and allowing the drops to fall into a plastic cup, creating a rubber cup lump. The material is then combined with formic acid to cause the latex to coagulate. Until the necessary sum is obtained, the procedure carries on for a few days [1]. Physically, CLNR is made of non-rubber material, water, and rubber. Because of surface evaporation, which produces a moisture gradient that promotes diffusion toward the drier surface, the moisture content of CLNR frequently fluctuates locally.