My decal products are decorative and not dishwasher safe. Firing decals have to be used for products to be safe for food serving. Printing firing decals requires very special printing systems and cannot be done with a laser printer / inkjet printer. The only exception is iron-oxide printing using HP laser printer and so called ‘Bel-Type’ decal paper https://drdecalmrhyde.com/shop/waterslide-decal-paper-firing-bel-type-laser-printers-a4/
I don’t specialise in ‘how iron-oxide printing works’ but all I can tell you is I have quite a few customers produce firing decals using a HP laser printer, the Bel Type decal paper and a kiln (for firing at 800+C). You can google this to find more detailed information.
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The content of this article is meant for informational purposes only and should not be considered a source of professional advice, recommendations, or endorsements. It is not a substitute for seeking expert guidance or making well-informed decisions based on individual circumstances. Although we strive for accuracy and reliability, we cannot guarantee the information's completeness or suitability for all situations. Readers are urged to verify facts, consult experts, and consider their own context before taking actions or decisions based on this content. No warranties, explicit or implied, are provided regarding the accuracy, timeliness, or completeness of the presented information. Relying on this information is at the reader's own discretion and risk. We encourage readers to consult relevant professionals or experts for advice tailored to their specific needs. Neither the author, publisher, nor any affiliated parties will be held responsible for errors, omissions, or damages resulting from the use or reliance on the information in this article.