This pre-treatment liquid has been developed specifically for use with UltraChrome DG ink. It is required when printing on black or dark colour garments to ensure the best quality output.The liquid is concentrated and needs to be diluted with pure water in a ratio of 1:1 to 1:3 (pre-treatment to water). Once it has been diluted, the liquid can be applied directly to the garment before printing.Epson recommends the use of only genuine Epson pre-treatment liquid as the use of other products may affect your print quality.