In one sentence, describe what the following article is about: Some varieties of hydrangea can bloom pink or blue depending on the soil's aluminum content and acidity. Most cultivated hydrangeas of this type belong to the species Hydrangea macrophylla, but some members of this species only produce white blooms, or favor the pink or blue side too heavily for easy adjustment. Ask the previous owner of the hydrangeas to identify your hydrangea variety if you are not aware of its name. The varieties named Enziandom, Kasteln, Merritt's Supreme, Red Star, and Rose Supreme all have the ability to be grown as pink or blue blossoms, although they vary in intensity. . Most garden supply stores sell a pH test kit for measuring the pH, or acidity, of your soil. Because acidity affects the hydrangea's ability to take in aluminum, which in turn affects the flower color, you can get a rough prediction of the flower color by measuring the soil pH. As a rule of thumb, a soil pH below 5.5 will likely result in blue flowers, and a soil pH of 7 and up will likely result in pink or red flowers. The effects of soil pH levels between 5.5 and 7 are difficult to predict. They may result in blue, pink, or purple flowers, or in a blotched blue and pink pattern. To encourage a blue color during the growing season, mix 1 tbsp (15 mL) aluminum sulfate into a gallon of water. This both adds aluminum to the soil and increases the acidity (lowering pH), making it easier for the plant to use the aluminum. Once every 10–14 days, Apply as much of this water as you would in a normal watering. Continue to measure the pH of the soil, and stop applying once it drops below 5.5 pH. Alternatively, you can also create blue blossoms by applying a fertilizer that is low in phosphorus and high in potassium. Look for a 25/5/30 fertilizer blend. You'll also want to avoid superphosphates and bone meal. If the hydrangea is already blue, it is hard to make it pink due to the existing presence of aluminum causing a blue color. However, you can take precautions in advance to encourage pink blooms, or you can grow your plants in a pot. Avoid planting near driveways or walls, as some concrete mixes or mortars can leach aluminum into the soil.  Apply a fertilizer that contains no aluminum, but high levels of phosphorus, which inhibits aluminum uptake. Look for a fertilizer that contains a 25-10-10 blend. Consider raising the pH by adding wood ash or crushed limestone to the soil, as this also makes aluminum uptake difficult. Avoid raising the pH higher than 6.4, or the plant may develop health problems.
Summary: Check whether your species and variety produces different colors. Test soil pH Turn blooms blue. Encourage pink blooms.

If you notice a stain on your felt hat, use a gum eraser or clean makeup sponge to remove it. Gently dab the stain (or smudge) to try to remove it. Alternatively, purchase a dry cleaning sponge from a hardware store (designed to absorb dust, dirt, and soot) to remove stains. If you notice a grease stain on your hat, sprinkle some corn starch directly onto it (approximately 0.5 tbsp - 0.25 oz). Rub it into the stain gently. After 5-10 minutes, brush it away to see if it has absorbed the stain. Use a cloth dampened with fabric stain remover to wipe stains. For a gentle stain remover, purchase Woolite fabric stain remover. After treating stains, rinse the cloth and re-wipe stains to remove stain remover from the hat.
++++++++++
One-sentence summary -- Use an eraser or make up sponge. Sprinkle corn starch on stains. Brush with fabric stain remover.

Q: Ich parasites may not be very visible when they first start to form. But once they start to feed on the bodily fluids of your fish’s skin and fins, they will encyst themselves and show up as small flecks or white spots. It may look that your goldfish has been dusted with salt or sugar, but in fact, they are suffering from ich. If you don’t notice the ich treatment early, it may develop into large white patches on your fish’s scales and fins. This is a sign more ich parasites have attached to your goldfish. The goldfish ich will cause your goldfish to, well, itch! He may brush his body against objects in the tank or against the sides of the tank in an effort to stop the itch. Because your goldfish is under distress, he may not be getting enough oxygen in the tank. This will cause his gills to go into overdrive and lead to heavy and rapid movement of his gills as he tries to breath.
A: Check for small white spots on your goldfish. Note if your goldfish is brushing against objects or the sides of the tank. Look at your goldfish’s gills.

Problem: Article: Nails grow about 1/10 of an inch (2.5 mm) every month, meaning that it takes 3-6 to grow a full nail. If you cut your nails frequently—say, once each week or two—you won't need to worry about them growing too long or too wild. If your nails begin to hurt at the edges, you might be developing an ingrown nail; try to trim away the painful growth before it goes too deep, but it would be wiser to seek a health care professional. The goal here is to remove the "free edges" of your nails: the opaque, off-white crescents that grow at the tips of your nails. Cut the nails almost completely straight across, and round them a little at the corners to keep the nails strong. Cutting the nail straight will reduce your chance of developing ingrown nails. If you are a finger-style guitarist, consider leaving the nails long on your picking hand. Keep at least 1/16th inch (1.5 to 2 mm) of nail on each finger of your picking hand. It can be tempting to keep on trimming your nails (for the sake of convenience, aesthetic, or compulsion) even after you've removed the "free edge". If you trim too deeply, however, you will expose the sensitive skin beneath the nail, and you may increase your risk of infection. Try to keep the ends of your nails even with the top of your finger – or remove all but a tiny sliver of the opaque "free edge".
Summary:
Trim your nails often, but do not be overzealous. Cut your fingernails. Be careful not to cut too much.