Nano-gold uses high-purity gold as raw material, and the gold is made into a particle size below 15nm through a special new processing technology, which greatly improves the inherent characteristics of gold. Purity: 1000ppm Particle Size: 5-15nm About Colloidal Gold Nano Gold Solution: Colloidal gold benefits: Nanogold is made by using high purity gold as raw material, through a special new processing technology to make gold particle size of 15nm or less, greatly improve the inhere