Sometimes it's hard to know whether an ink color you want may match an ink color you may already have. Several people out in blogland have been kind enough over the years to post swatch cards of various brands. I have a mix of brands - Papertrey Ink, Amuse, Fresh Ink, Memento, and Colorbox mostly - and stamped these swatch cards to keep at my stamping table so I can reference them as needed.
My reds and pinks:
My oranges and yellows:
My browns and grays:
I noticed that some of the colors show up not true to life. Like Pure Poppy and Strawberry look nearly the same on this blog post but they are really quite different IRL. Pure Poppy is a much deeper (bluer) red than Strawberry which has more watermelon/coral in it. And Memento is not nearly that obnoxious looking. Nonetheless maybe it will help give you an idea of it and help someone out there. :)
Easter blessings to you all...