Back then I had a Petri FT with a 55mm 1:1.8 lens, a 35mm 1:2.8, a 135mm 1:3.5, a 400mm 1:6.3, a 2X TC, and extension bellows. I did not have a flash but later did obtain one, make and model long since forgotten. Since then I obtained a 200mm 1:4 and a second 2X TC. Still have it all and everything works well. Glass is all clear without fungus or dust. I had no bag at that time, just the cases with straps to carry it all over my shoulders. I did have a small case for a movie camera that was bequeathed to me when my father passed away, but it was not sufficient for all I had. I managed to get many good photos of the countries I had visited a few years earlier while in the military and continued to get some for several years after.

KODALITH! WOW! Back in the analog darkroom, that was one of my favorite materials for special effects and experimentation. I used it for every manner of high contrast work; line dropouts, e aforementioned solarization, posterizations, stripping in copy into halftone images, creating my own texture screens and more. Oftentimes, several inter-negatives, inter-positives. and hand retouching (opaquing) was required to arrive at the desired effect. Sometimes a kind of reversal exposure was applied during film processing or printing to get the wanted results. Sine, in the olden days, mostly prints were made, not screen images, there was also the additional option of using high contrast papers and solarizing during print development. Nostalgia!

Fast forward to the digital age. I have tried many experiments to replicate the effect of using Kodalith, Fugilith, Agfa lithographic materials, and 3-M Color-Key. Manipulation of contrast, converting to monochrome, altering individual colors and other post-processing procedures seem to be a hit and miss, trial and error affair. Sometimes masking actions were applied but I was unable to exactly replicate the "look" of the above mentioned orthochromatic films and the accompanying processes.

So...I downloaded several apps on my Android-based tablet, the ones that claimed to enable some of the aforementioned special effects. The ones that I found are most effective and offer the most operator-controlled manipulation besides presets, are ARTO- Arto Sketch, and Arto Monochrome. After the basic effect is achieved, you can share it with another app or your preferred software and further alter density, contrast, sharpness or other aspects of the image. These (Arto) are free downloads and for a nominal fee, you can get the pro versions with offer high enough quality for printing and commercial reproduction. I use these in my commercial work where special effects are required. Art also offers other apps that simulate oil paintings and other art mediums as well as ones that look like inferred renditions of images- this may also prove to be handy in high contrast experimentation. Theses apps enabled me to come very close to the original analog effects.

Similar effects can be obtained on PhotoShop and Lightroom, with Topaz and other plugins and using the sliders as I previously alluded to, however, the app method is faster and easier and you still can maintain a good degree of control.

PS- To the OP- If you like, post a downloadable image and I will apply one of the effects so you can get a better idea how it might work with you own images.