What is the technique
Fiber etching
This method also known as Devore works best on fabric blends that contain both cellulose and non-cellulose. The chemical in the etching liquid “eats” away the cellulose, leaving the non-cellulose within the fabric intact.
Bleaching
It is the destruction of colouring matter from the textile to achieve the original colour or the raw colour which is white.
What are the relevant materials needed for the technique
Fiber etching
Etching Liquid
Velvet – 80% rayon and 20% silk
Silkscreen/Paintbrushes for pattern
Bleaching
Black/dark-coloured fabric
Bleach
Paintbrush
Spray bottle
Rubber bands
How to achieve the technique
Fiber etching
Protect your surface first and steam your velvet fabric to ensure there is no wrinkles. Lay the velvet flat on the table and either use a paintbrush or silkscreen to print the pattern on the velvet. Similar to the thermochromic ink, scrape the etching liquid until it is equally distributed. Carefully remove the silkscreen frame and use a hairdryer to dry the ink thoroughly or air dry it over a few days which was what we did. Once dry, sandwich the fabric in between baking paper and iron till the etched part turns brownish-burnt. Then wash the fabric in warm water until all the burnt parts are removed.
Bleaching
Dilute the bleach with water using a 1:1 ratio and put the mixture in a spray bottle. You could either fold the fabric, layer a pattern over or paint the bleach onto the fabric to create patterns. If folded, secure the fabric with rubber bands. Then spray the fabric with bleach. Wait until the colour starts changing and satisfies how bleached you want it to be, then wash the fabric. Unravel the fabric and let it dry.
What are the uses and applications of the technique
Fiber etching
Bleaching
Photos
Fiber etching 
Bleaching
Own personal reflections
Both fibre etching and bleaching allows you to customize the pattern especially when the liquid is hand painted. The fibre etching sampled that Galina showed us made me realised that even after the etching, more details such as glitter glue or dyeing could be added on to enhance the etched areas. The challenge faced for bleaching was the concentration as certain fabrics the change was not very visible. Moreover, if the area of fabric was large, the speed of bleaching would differ and some areas would be more bleached than the rest.