The phrase "dilution ratio" refers to the proportion of a substance that is mixed or diluted with another substance. It indicates how much of the original substance is present compared to the additional substance used to dilute it. Full definition
Additionally, the amount used in this recipe is well below the recommended dilution ratio for SLS on skin and the SLS in Sal Suds comes from Coconut Oil. (wellnessmama.com)
Do a Google search to find proper dilution ratios.) (happywithbaby.com)
Incubate sections with primary antibody diluted in 1x TBST for 1 hour, or overnight at 4 °C; the optimal antibody dilution ratio should be pre-determined by experimentation. (ptglab.com)