Which one of your Black Hole Quencher® dyes do you recommend using to label proteins?

Our Black Hole Quencher® 10 succinimidyl ester (BHQ-10S), is a water soluble BHQ® dye specifically engineered for conjugating to proteins. BHQ-10 will function as a FRET quencher for fluorophores located up to 100 angstroms away. All other BHQ products are insoluble in aqueous solutions and are not appropriate for protein labeling.