Abdohoo.App
Notes from the studio
Guides, explainers and product news from Abdohoo.App Solutions, for shopkeepers, mosque communities, Quran students and dyeing masters.
Shade cards and colour naming systems in textiles
A shade card is a set of colour samples used to specify colour. Names like "olive" are ambiguous; systems such as Munsell, ISCC-NBS and CIELAB tie a name or code to a position.
Reactive dyeing basics: why salt and soda ash (and how to stay safe)
In reactive dyeing of cotton, salt pushes the dye onto the fibre (exhaustion) and soda ash raises the pH so the dye bonds to it (fixation). Unfixed dye must be washed off.
Metamerism: why lighting changes fabric colour
Metamerism is when two fabrics match under one light but not another, because their reflectance spectra differ. Check matches under several standard lights before approval.
How to match a fabric colour with your phone camera
A phone can get you close to a fabric's colour if you control the light, put a known reference (white paper or a grey card) in the frame, average several shots and lab dip.
The lab dip process in textile dyeing, step by step
A lab dip is a small trial dyeing that proves a recipe before bulk. You dye swatches of the real fabric, compare them with the standard under agreed lights, correct and submit.
How to make and use a dye stock solution for lab dips
A 1% w/v stock is 1 g of dye made up to 100 mL. To dose a recipe, pipette mL = grams of dye × 100 ÷ stock %. Use a 0.1% stock for pale components so the volumes stay measurable.
Grey card vs white paper for colour correction
Both give the camera a known neutral to correct white balance and brightness. White paper is free and good enough for everyday work; an 18% grey card is more consistent and clips less.
CIELAB and Delta E (ΔE2000) explained for dyers
CIELAB turns a colour into three numbers: L* (lightness), a* (green–red) and b* (blue–yellow). Delta E is the distance between two colours; ΔE2000 weights it like the eye.
Why offline prayer times matter, and what really works without signal
Prayer times come from the sun and a mosque's timetable, and neither needs a live connection once it's on your phone. A well-built app keeps times, alarms and the Qibla working when the signal drops.
Why Jumuʼah times differ from one mosque to the next
Jumuʼah is prayed in the time of Dhuhr, but each mosque sets its own Adhan, khutbah and Iqamah. Clock changes, khutbah length, space and local working hours explain most of the difference.
Salah Locator 1.2: add your mosque and see where times come from
Salah Locator 1.2 lets anyone add the mosque they attend, lets worshippers report a wrong prayer time for the mosque to confirm, and labels every timetable with where its times came from.
Suhoor and iftar times: a practical guide to timing your Ramadan fast
The fast runs from true dawn (Fajr) to sunset (Maghrib). Finish suhoor before your mosque's Sehri or Imsak time, break your fast at Maghrib, and follow your mosque.