Javana Color Blocker makes very easy resist effects possible on light fabrics. It works almost like a masking fluid does on paper.
Paint or pipe the Color Blocker onto the fabric - wait until dry.
Working with a sponge roller*, apply a heat-fixed fabric paint over. The technique works most successfully with a fabric paint that does not bleed through the fabric eg Jacquard Textile Paint, rather than a flowing paint that wants to spread eg Jacquard Dye-na-Flow**.
Once dry, fix the the fabric paint by prolongued ironing on cotton setting.
Hand wash the fabric to remove the Color Blocker to reveal the negative design.
TIPS: Color Blocker sits on the surface of the fabric stopping the paint making contact with the fabric in that area Washing the fabric immediately after iron-fixing the fabric paint MAY result in some of the colour washing away. If this is an issue, leave the fabric to 'cure' for a couple of days before washing. *Using a roller will allow for the greatest application of colour with the least abrasion of the surface. **A flowing paint like Dye-na-Flow is more likely to wick through the fabric underneath the Color Blocker
HINT: the medium itself is a not very attractive dark grey gungy colour - don't let that put you off - it washes out!