Different ink is suitable for different printers.What you should take into consideration is that what ink they use for the specific product your want, e.g., postcards, and then ask them what will best suit it to get the best quality full color prints for your project.
As for those who want to start up business ,their print may explain some variety of ink options.These include dye-based inks, pigmented inks and UV curable inks. These substances have certain features in common such as delivering good quality full color prints. But they also have different properties so not all of them may fit into your requirements or the use of your printouts.
Dye sublimation ink is used wildly in present society.Dye-based inks are smooth-flowing water-soluble substances which have vibrant colors but have low lightfastness. Lightfastness refers to the ability to resist fading brought about by exposure to light. This type of ink can be absorbed by most paper media. Since they dissolve in water, accidental spills, rain or even moisture can ruin prints easily. Hence, they are not suitable for outdoor display or for labels that will be exposed to wet areas.Some dye- based inks are mixed with solvents to facilitate drying. Others apply a layer of coating to protect the inks. Dye-based inks can lower the cost of production since they are relatively.