Best Alum Thickeners of 2026

"I've used this alum powder for my homemade deodorant, and the fine, pure texture blends seamlessly into my recipes. It dissolves effortlessly and feels great on my skin. The product's consistent quality and lack of odor make it a staple in my self-care routine. If you're into DIY products, this is a must-have."

"As an avid gardener, I've found that dipping hydrangea stems in alum really helps them stay fresh in bouquets much longer. Even wilted blooms can perk back up using this trick. It's like a little science experiment that actually works!"

"This alum worked wonders when I soaked my new aquarium plants to remove pests. It did the job perfectly and was easy to use. I also appreciate the sturdy and resealable container—super convenient for occasional projects."

"I mainly use this alum for making crystal pickles, and they always turn out super crispy. The quality is reliable every time, which is exactly what I need for my yearly batch."

"I purchased this for my relatives; they create a paste to help stop bleeding from minor cuts. The large size makes it a great value, and they’re very happy with how well it works for their needs."

"I dissolve a little of this granulated alum in water to use as a topical antiseptic and to prevent perspiration. It’s very easy to use and works effectively, but I make sure to let it air dry before dressing to avoid any risk of staining clothes."

"I use this product for tanning animal hides and have been impressed by the great price and top-notch quality. It’s exactly what I needed for my projects!"

"I purchased this alum to make my Icecle Pickles, and I’m sure it’ll make them perfectly crisp. The quality seems ideal for food preservation."

"I tried this alum as a remedy for canker sores after other treatments failed. Although the texture is a bit more granular than powdery, it was still easy to apply. After just one use, the soreness disappeared, even though the spot was still visible. Highly effective for mouth sores!"

"I noticed a visible improvement in my skin after just two uses. I mix this into my homemade face mask every week, and the quality and packaging have both been great."

"I was happy to find this product in powder form instead of a deodorant rock. I use it in a spray bottle for skin relief and it works perfectly—relieves itching for hours. Looking forward to keeping this on hand."

"I bought this to use with my grandkids when we make playdoh, and it works like the alum I'm used to, but I did notice it's more granulated—similar to small sea salt—rather than a fine powder. Next time, I'll look for a finer option for extra smooth playdoh."

"As someone who enjoys home pickling and occasional DIY crafts, I found this product to be a great value for its intended use. While the package size is modest, it delivers excellent results for crisp pickled vegetables and is also handy for things like homemade deodorant. If you’re a hobbyist or looking for a multipurpose alum, this is a solid choice."

"I used this alum for dyeing fabric and was happy with its effectiveness as a mordant, creating a strong bond between fiber and dye. The crystal form worked well for my projects, though I wasn’t using it for food. Despite some mess with packaging, the product itself performed as expected."

"My wife and I pickle a lot of vegetables, and this alum made a noticeable difference in crunchiness. We also tried it as an ingredient in a homemade deodorant spray, and it worked well for that too. Good quality and affordable—highly recommended for multiple uses."

"As someone who loves heavily planted freshwater tanks, I've found this product to be a game-changer for killing pests without harming my plants. It’s super simple to use and works even on stubborn snail eggs. Just remember to soak your plants in water after treatment if you have delicate tank inhabitants. Overall, it’s made my aquascaping much easier!"

"I bought this to help with tanning rabbit hides, and I’m really satisfied. After soaking the hides, the fat came right off, and I barely had to do any cleaning afterward. The product goes a long way—I managed to do nine hides and still have enough left for more. For the price, it’s a great value and I plan to buy more for future tanning projects."

"I purchased this for science projects with my daughter, and the large quantity has been a huge money-saver. It works great for all sorts of activities, like making geode rocks. Every project we try comes out looking fantastic, and we never run out of ‘salt stuff’ for our experiments."

"I've used this alum to reclaim denatured alcohol after cleaning resin prints, and it has worked well as a flocculant for my needs."

"Dealing with old steam whistles, I found this alum dissolves steel screws from brass parts effectively when boiled. Still adjusting the mixture, but overall, I'm satisfied with the results and the price."

"I bought this hoping to grow crystals, but it did not work for that purpose, which makes me doubt the purity or the actual composition of the alum."

"I've found this alum powder to be remarkably effective for keeping my hydrangeas looking fresh for weeks. The generous amount means I won't run out anytime soon."

"I mainly use this for hide tanning and love that it's food grade and works perfectly for preserving hair. It's also great that I can use it for pickling if needed."

"This alum powder has become my go-to for natural deodorant recipes and even managing cold sores. I appreciate that it's potent and safe for body use; plus, the expiration date is clearly marked, which gives me confidence in its freshness."

"My order showed up open and the contents had exploded, which was really disappointing!"

"Trying to return this was a nightmare—the process is so frustrating!"