The tools used to clean the objects is called cleaning tool. The cleanliness of any object is depend on the quality of cleaning tool.
Chalk is calcium carbonate - CaCO3. Any chemical compound contain some impurities.
i do not believe there is any possible way to preserve sidewalk chalk.
Any, the answer depends on what the experiment is about.
A statement of fact? If this is another question just type it into google.
Any carpet cleaning company is also able to clean upholstery. In addition you may rent the tools (generally from a grocery store or home improvement store) and clean them yourselves.
You can go to the website of the company that produced the purifier and see if they offer any information on cleaning their product. If they do not, then you can go to http://www.holmesproducts.com/careandcleaning.aspx?cid=215 to learn general air purifier cleaning instructions.
it can be any color usually normal chalk is white but crayola's brand is as many colors.
Any martial arts supply company will sell breaking boards. And you can buy pine boards at any lumber company, they do have to be completely dried and cut to size.
Cleaning cooking tools is importatn so as to not create a risk of foodborne illness. A simple method is to use a scrubber or abrasive sponge, dish soap and warm water. Each cooking tool must be cleared of any reside or food after they've been soaked, scrubbed and rinsed off.
they need white chalk or any kind of regular chalk not like 3 d or colored chalk
Chalk Paint is a type of paint that you can put on a wall then a couple days later, you can draw on it with chalk. Before you draw on the paint, it will take about a day to dry. You can find chalk paint at Home Depot or any other store like it.