Kodak 指示劑停影液（液體）用於黑白底片與相紙（可調製8加侖）

The color-change indicator is really handy—you can see at a glance when the solution is exhausted, which takes the guesswork out of timing. For the price, getting 8 gallons of working solution is a solid deal for home darkroom work.

The indicator dye is a lifesaver—it turns purple just as the bath loses strength, so there's no guesswork. Mixed up a gallon to process a batch of 4x5 sheets and it worked perfectly, no stains or issues. Exactly what I needed for consistent results in the darkroom.

The color-change indicator is such a practical feature—it turns purple when exhausted, so I never have to guess if it’s still good. Mixed up my first gallon batch yesterday and it neutralized the developer smell perfectly, just as expected. Really solid value for the price considering it makes eight