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.