How ink on paper behaves on paper

- [Instructor] You have to consider that…applying Ink to Paper is a physical process.…And as such, there are some limitations.…For example, something called Total Area Coverage, or TAC,…we sometimes hear it called TIC, Total Ink Coverage,…but there's a limit to how much ink you can pile up…on a piece of paper on a given press.…Now, what do I mean by Total area coverage?…How do I measure that?…Well, add up the numbers.…For example, I've given you a value here,…Cyan 100, Magenta 50, Yellow 20, Black five.…

You add that all up, it's 175%.…Now coated papers support a higher Total Ink Coverage.…Uncoated papers, because they're absorbent,…have to have a lower TAC.…And like I said, this is sometimes referred to as TIC.…So, what happens if you you exceed Maximum Ink Limits.…Well, on a sheetfed offset press on coated stock,…your ink limits are around 320 to 340%.…That's pretty generous.…On a heatset web offset press, which sort of bakes the ink,…if you wanna think of it that way,…on coated stock, 300%, which is really good for a web press.…