It can enhance text or make it stand out a bit. You may want to do it for important headings for example. If you are designing a poster or a sign, you might have some or all of the text with borders and/or shading. There are lots of situations where it can be useful.
shading
Lino drawing, is drawing without shading or adding tone to your drawings.
Adding black makes the original color darker. The hue of the color depends on the color that the black was added to.
Adding black to a color will create a darker version of the color.
The purpose is to make it sweet.
The answer is white. However, yellow might be added to a color as well to make it lighter, but it might change the original color. Also, when you add white to a color it is called "tinting" the color. When you make a color darker by adding black, it is called "shading". Shading is also a technique in drawing. Be careful not to try shading and tinting because the result is the color is "grayed", by adding black and then white you cannot reverse the effects of the black, only change the effect. I hope this helped!!
There are not much purpose of that.
Removes the colouration.
Borders can make important data stand out. You could (for example) use borders when creating something like a 'pro-forma' invoice - to help a person manually complete the form.
[Shift] + mouse click will select all from the first selected to the one you shift click. [Ctrl] + click will select individual files, adding them to the group selected, without adding any others.
This depends on what you think the purpose of tea is. Iced tea is a nice refreshing drink to have in the summer. So if your purpose for drinking tea is to have a cool summer drink then, no, adding ice does not take away the purpose
Adding sodium chloride soap is precipitated.