I have found several search results related to lash and brow spa products, including details about ingredients, materials, and positive and negative aspects. Here are some key points from each source:

1. Lashx.pro provides information on choosing the right lash extension cleanser. The article emphasizes the importance of using a cleanser that is specifically made for lashes and avoiding ingredients that can be harmful to them. Some ingredients to avoid include sulfates, surfactants, and parabens. Instead, look for products that contain ingredients like aloe, biotin, panthenol, silk extract, cucumber, or humectants, and other non-irritating antioxidants. The article also recommends looking for products that are ophthalmologist tested and made specifically for eyes and lashes.

2. Beautiful Brows & Lashes Professional offers Material Data Safety Sheets (MSDS) for their products, which provide detailed information on the ingredients used in their products.

3. RefectoCil provides a product information sheet that includes ingredients for their lash and brow products. For example, their No. 1 Pure Black Eyelash and Eyebrow Tint contains ingredients like Aqua, Cetearyl Alcohol, Bis-Diglyceryl Polyacyladipate-2, PEG-40 Hydrogenated Castor Oil, Toluene-2,5-Diamine, Sodium Cetearyl Sulfate, Sodium Laureth Sulfate, m-Aminophenol, 2,6-Diaminopyridine, and CI 77499.

4. Ruthie Belle provides information on the chemistry of lash and brow lifts. The article emphasizes the importance of using products that are not too aggressive and damaging to lashes and brows. The curling lotion is the most aggressive stage of lash lifting, and products with short processing times are the strongest. The article also lists some ingredients to look out for, such as Travoprost, Tafluprost, Noralfaprostal, Methylamido-Dihydro-Noralfaprostal, and Isopropyl Cloprostenate.

5. Elysium Instruments provides information on lash glue and its ingredients. Lash glue is made of three basic things: cyanoacrylate-based adhesive, color pigment, and additives. Cyanoacrylate is a popular industrial strength glue that is marketed as super glue. Additives are necessary to increase the viscosity of the glue and make it more stable. The article recommends asking for Material Data Safety Sheets (MSDS) when working with chemical manufacturers abroad to get an idea of what type of ingredients are being used.

6. Actiiv Hair Science offers Amplify Lash + Brow Serum, which is formulated with natural ingredients and safe to use on even the most sensitive skin. The serum is used nightly on clean, dry skin.

In summary, when choosing lash and brow spa products, it is important to look for products that are specifically made for lashes and brows and avoid ingredients that can be harmful to them. Some ingredients to avoid include sulfates, surfactants, and parabens. Instead, look for products that contain ingredients like aloe, biotin, panthenol, silk extract, cucumber, or humectants, and other non-irritating antioxidants. It is also important to ask for Material Data Safety Sheets (MSDS) when working with chemical manufacturers abroad to get an idea of what type of ingredients are being used.