The specimens are then compared with their originals, and the intensity of yellowing is assessed with a James Heal Grey Scale for Staining (or relative yellowness index values). The treatment time is 16 hours, which permits one day's specimens to be incubated overnight and to be assessed on the following day.Īt the end of the test, the Perspirometers are removed from the incubator or oven, the test packages are taken out and are allowed to cool before unwrapping. Up to four Perspirometersare placed in an incubator or oven, at a temperature of 50☌ ± 3☌. The pressure is standardised by the application of a weight. To ensure uniform contact between the test papers and the test specimens, the packages are placed in a Perspirometer- up to three test packages in one instrument. The packages are closed and sealed with ordinary adhesive tape. If there are more than five test specimens, additional test packages are prepared.Įach package is wrapped in BHT-free polythene film. The sandwich is then placed between two glass plates.Ĭaution: Do not use acrylic or plastic plates.Ī standard test package consists of five test specimens and one control fabric - each separated by a glass plate - making a total of seven glass plates.
The test paper is folded along its axis and the specimen to be tested is sandwiched between the two layers. The procedure is based on a 'test paper', which has been mechanically impregnated with a methanol solution containing the phenolic compound. Overall first impressions? These are great colours to play around with if you’re scared of at home hair dye, or just want an easy temporary change without too much commitment.The risk of phenolic yellowing is evaluated by a 'contact test'. Johanna tried out the mint, the pink, and the purple, and though the purple and pink didn’t show up quite as much as we’d hoped, the turquoise was totally perfect, and according to her report today-“The mint in my hair faded really nicely- good fade quality.” I tried out the silver, but because I already had faded pink Manic Panic in my hair, it turned a super pretty smokey purple-grey shade, which is fading nicely into silvery lavender magic after only one wash. Johanna and I have been doing our hair together since the very beginning (she’s the person who taught me the secrets of pastel hair!) so I knew she’d be up for the task. I wanted to try a handful of Tinge colours all at once, so I got my good friend/hair guru/pastel intern Johanna to donate her head for experimentation. You can even keep using Tinge in the shower to maintain the colour, or let it fade to an even more powdery hue. The best part? It’s almost impossible to mess this colour up! As long as your hair is bleached to a light enough shade, you’ll end up with perfect pastel hair every time. Cruelty-free and non-damaging, it comes in turquoise, purple, silver, pink, and peach, and rinses out in 3-5 washes, making it the perfect pastel beginner product line. Tinge is a pastel conditioner line that’s lovingly made in San Francisco. That said, I’m always open to anything that will make the process easier, and that’s just what Tinge brings to the table (erm, shower?) I’ve been dyeing my hair pastel colours for years now, and though it’s a lot of work, I’ve come to really appreciate the time I spend blending colours and playing around with different formulas.
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