The title. Also why does some cardboard packaging sometimes just have random colors in one small area
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Quality control.
The clock on moulded parts is used to indicate when a part was produced, or what production run.
This can be used in various ways – for example a builders hard hat is only guaranteed as effective for a certain length of time, so the mark is used to indicate the manufacture date so you know when it should be removed from circulation.
In other cases it can be used to pinpoint a particular mould or production run if problems are discovered and so on…
The coloured blocks on printed media (cardboard boxes, newspapers, etc) is a test for the inks used in the printing – if you see the full set of colours (cyan, magenta, yellow plus blacks) and they all look correct then your print run is correctly calibrated, if there is a problem with any of them then there is an issue that needs corrected.
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