Q: If you can't find any identifying stamps and you're unsure about the origin of the jewelry, use a testing kit to find out what the jewelry is made of. Purchase an acid testing kit from an online retailer or jewelry supply store. This kit will include a sanding stone and several bottled acids. Buy a kit that can test for both silver and platinum. The bottle labels will indicate which metal they are used to test for. If the kit doesn't include gloves, buy some separately. If you get any acid on your hands you will burn your skin. Lay out the black slate stone on an even surface. Gently rub the jewelry against the stone in a back-and-forth motion to create a line. Draw 2 or 3 lines on the stone or one for each testing acid you'll use. For example, if you're testing for platinum, silver, and gold, you'll draw 3 lines. Choose an inconspicuous part of the jewelry to rub against the stone. The stone will scratch and damage a small section of the jewelry. Lay a towel down underneath the stone to protect your work surface from scratches. Select an acid test from your kit and carefully drop a small amount of acid onto one of the drawn lines. Make sure that you don't mix the different acids together or you'll affect your results. Most tests have acids specifically for silver. However, you can also use an 18-karat gold testing acid to identify pure or sterling silver. Always wear gloves while handling acid. These reactions can take anywhere from a second to a minute. If the line completely dissolves, the test fails. For example, if you drop the Platinum acid test on a line and the line dissolves, the jewelry isn't platinum. However, if your line doesn't dissolve, the metal is pure. If you use the 18-karat gold acid test to test on silver, the line will turn a milky white color. This will indicate that your jewelry is pure or sterling silver. If you doubt your results, test the jewelry again to be sure.
A: Use an acid testing kit on hard-to-verify jewelry. Rub the jewelry against the stone. Drop the acids on the different metal lines. Observe the reaction of the acid.

Article: If the crust of food on your stove isn't coming off with soap and water, try a towel "mask." Wet a dishtowel, wring it, and warm it in the microwave for 30 seconds. If your microwave is particularly powerful, be careful of any hot steam coming off the towel when you open the microwave. Use the damp, warm towel to cover any stuck on bits on the stove, leaving the towel in place for 15 minutes. You can repeat this step several times. The warm steam helps loosen stuck on gunk on the stove. When the mess on the stove is loose, scrub as normal with warm water and soap. If soap and water alone aren't cutting the grime on your stove, you can create a mix of 50% white vinegar and 50% water as a homemade cleaning solution. Scrub your stove using the solution with the rough side of a sponge. When finished, rinse your sponge and clean the stove with plain water to cut the strong smell of the vinegar. Dry the stovetop with a clean kitchen towel. It may help to open a window for ventilation. If your stains have been set for months, you may want to try a commercial over cleaner on the stovetop, such as Easy-Off Oven Cleaner or Goo Gone Oven Cleaner. As most stovetops and ovens are made of the same materials, a solution that is cleared for your oven should be no issue on the stove. Follow the cleaner's directions carefully, ventilating the area if necessary.
Question: What is a summary of what this article is about?
Heat a wet towel. Cover stuck-on grime with your warm towel. Use a solution of white vinegar and water. Rinse the vinegar-water solution. Employ a commercial oven cleaner.

Q: For parkour, you need to wear thin-soled shoes that have a one-piece sole. Thin soles let you feel the wall better, improving your technique, while one-piece soles won't rip off in pieces as easily. The shoe should have a well-defined arch to help you dig in your heels. It should also have a soft rubber for the best grip. If you want to learn parkour in a more controlled, safe environment, look for a parkour gym in your area. They'll have coaches on hand to help you learn the techniques. Basically, you are using your momentum to get up the wall. Therefore, you have to take the wall while jogging. Parkour is not for the faint of heart. You can fall or injure your ankles while trying to do parkour. As you reach the wall, push off the ground with your non-dominant leg. You should be close enough to the wall that you can easily hit it with the other leg. In other words, you need to be within a foot or two. Basically, you are trying to push yourself as far up the wall as you can. Immediately as you get to the wall, push your arms up. You need to be ready when you approach the top of the wall to grasp it. Using the ball of your foot, plant your foot on the wall. Use that foot to change your horizontal motion to vertical motion, pushing yourself up the wall. As you do, be sure to lean in towards the wall, as it will keep you moving upwards rather than away from the wall. Using your non-dominant leg, run another step up the wall. Basically, you're still trying to get as far up the wall as you can. All of these steps must be done in quick succession. You can take a third step, but more than three steps is probably pushing it. Grab the top of the wall with both hands. Pull yourself upwards. As you reach the top, push yourself like you're climbing out of the pool. You can then simply push until you can put your foot on the wall and stand up. Alternatively, you can swing a leg up to the side, pushing it over and drop down the other side of the wall.
A:
Wear the right shoes. Pick up speed as you move towards the wall. Use your non-dominant leg to push off. Lift your arms. Catch the wall with your dominant leg. Climb again with your other leg. Pull yourself up.