A photographic emulsion based upon photopolymer and diazo chemistry. It incorporates all of the qualities of our 250 diazo emulsion, and our pure photopolymer T-1000 emulsion. Holden's 250 Extra will give you exceptional fine detail and exceptional durability in long runs.
From the product label:
DOUBLE CURE / WATER RESISTANT / SOLVENT RESISTANT
HOLDEN'S 250 EXTRA is a photographic emulsion based upon photopolymer chemistry. It incorporates all the qualities of our 250, and T-1000 emulsions. 250 gives you exceptional fine detail and durability in long runs. It may be used with any mesh, and is reclaimable.
INSTRUCTIONS: Dissolve powder in a small jar with cold water. Mix powder into emulsion. Stir slowly with wood, or glass paddle. Allow any bubbles to disperse. Mixture has a shelf life of 4-6 weeks at room temperature. Develop screens with cold water.
KEEP IN DARK PLACE. Store in a cool dry place. Protect from freezing.