I like this developer. It is not hard to make but I wish someone had shown me, hands-on, before I started making my own. Patience and care are needed and I have a few tips and tricks I can share.
This workshop can be combined with others as part of the process can be like watching paint dry.
The cost of the half day workshop is 40 euro
You get to take home a bottle of 510 puro which is probably worth more than the cost of the workshop.