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How do you xxplain the problem that will be created if you mark the original baseline with a washable felt-tip pen instead of a pencil?
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What is iodine use for?
Iodine is used to form iodine form which is used as an antiseptic. Also, Iodine is used in many household cleaning products. As well as in many thyroid medications in order to treat or control Thyroid disease/disorder (such as hyperthyroidism)Iodine can also be used to test food for starch. After it has been added it changes the color of the food item to black or brown.A small amount of sodium iodide salt is added to table salt to make iodized salt.Iodine, in a felttip pen, is used to test for counterfeit paper money.
Who and when invented the first ever type of pen?
Please define the type of pen you are asking about. Some examples are: reed, quill, steel nib, fountain, ballpoint, gel, felttip, space pen.If you mean the quill pen: it was used from the sixth century to the nineteenth century, its inventor is unknown. Prior to the quill pen the reed pen was used. Reed pens have been found in fourth century BC Egyptian tombs, it is not known when or by whom they were invented. Fine point brushes were also used for writing for centuries.The quill pen became obsolete in the 1820s, following the introduction of the maintenance-free, mass produced steel nib by John Mitchell.
