The proofs are not sharp.

1st. The sensitive paper has absorbed moisture.
2d. It is too old. The paper cannot be kept good for over six weeks, unless special care be taken.

According to Mr. Bory, the sensitive paper altered by keep­ing is restored to its original good quality by simply brushing it over with a solution of 0.05 parts of potassium chloride or the same quantity of potassium chlorate in 100 parts of dis­tilled water, or a mixture of these two solutions, or one of iron chlorate.

By treating the insolated paper with these solutions, the image is destroyed, and the paper can be used again. One operates as for sensitizing, taking care to desiccate the paper, as it has been directed.

The proofs are brilliant during the development, but become dull in drying.

The paper not well sized. It has been dried too slowly.

Remember that it should be quite desiccated within fifteen minutes.

The paper is more or less yellow.

1st. The paper tinted with ultramarine.
2d. The sensitizing solution or the developer are not suffi­ciently acid.
3d. The washing (fixing) in the solution of hydrochloric acid was not sufficient to eliminate the iron salts from the paper.

The proofs harsh, devoid of half tones.