[Ian Grant]

Kodak D168
B&W Reversal First Developer

Metol 2g
Sodium Sulphite (anhyd) 90g
Hydroquinone 8g
Sodium Carbonate (anhyd) 44.5g
Potassium Thiocyanate 2g
Water to 1 litre

Kodak D67
(Kodak D19 + Thiocyanate)
B&W Reversal First Developer
Metol 2g
Sodium Sulphite (anhyd) 90g
Hydroquinone 8g
Sodium Carbonate (anhyd) 45g
Potassium Thiocyanate 2g
Potassium Bromide 5g
Water to 1 litre


Kodak R21a Bleach Bath

Water 750ml
Potassium Dichromate 50g
Sulphuric acid (conc) 50ml
Water to 1 litre

Use 1:9

ADD THE SULPHURIC ACID TO THE 750ml SLOWLY, DROP BY DROP.

Kodak R21b Clearing Bath

Sodium Sulphite 50g
Sodium Hydroxide 1g
Water to 1 litre


2nd Developer
Kodak D158

Metol 3.2g
Sodium Sulphite (anhyd) 50g
Hydroquinone 13.3g
Sodium Carbonate (anhyd) 69g
Potassium Bromide 0.9g
Water to 1 litre

Use 1:1

2nd Developer
Kodak D8

Sodium Sulphite (anhyd) 90g
Hydroquinone 45g
Sodium Hydroxide 37.5g
Potassium Bromide 30g
Water to 1 litre

Use Full Strength


REVERSAL PROCESSING

First Developer

D168 - Use Undiluted or 1:1 - 5-10 minutes at 20°C
Recommended for all Kodak continuous tone films.

Or D67 (D19 + Thiocyanate) - Use Undiluted -6 minutes at 20°C
Suitable for Panatomic-X

Wash 5 mins

Bleach R21a 3-5 mins

Wash 2 mins

Clear R21b 2 mins

Wash 30 seconds

Re-expose - 2½ mins, light source not specified, but 500w bulb at 1½ metres would be normal.

Second Developer
D158 1+1 2-5 mins at 20°C
or D8 FS 4 mins at 20°C

Wash 30 secs

Fix in normal acid hardening fixer.

Wash 15-30 minutes

While no specific time is listed for D168 6 minutes, undiluted at 20°C would be a good staring point. The formulae for D168 and D67 (D19 with Thiocyanate) are very similar. D19 is available commercially and can be adapted to make D67.