Lowest cost is achieved (for practical purposes) when using minilab chemistry. Costs per sheet are minimal; never calculated them, but vanishingly small compared to commercial lab development. Kodak chemistry is easier to get in the US, in Europe Fuji chemistry is easily accessible.
The usual; issues with temperature control and timing, mixing errors, physical defects due to handling or particulate contamination, etc. But if you stick to the prescribed development parameters, it's not particularly difficult to get good results.Whats is the main concerns when developing myself.. Any risk of failures?
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