Search found 6 matches

by 613 mitzvot
Tue Sep 19, 2023 2:10 pm
Forum: Inyanim
Topic: Techeiles as a Light-Fast Dye
Replies: 0
Views: 983

Techeiles as a Light-Fast Dye

Both Murex dye and indigo are incredibly light fast as natural dyes go.  Do we have a mesorah that techeiles was/had to be light fast at all? Rambam (Mishna Torah Tzitzis 2:1) says שעומדת ביפה ולא תשתנה, however Kesef Mishna says this is referring to the Gemara Menachos in which the Rabbis speak of ...
by 613 mitzvot
Sun Mar 05, 2023 6:02 pm
Forum: Inyanim
Topic: Nignaz
Replies: 46
Views: 13282

Re: Nignaz

A bit of a more specific question relating to nignaz; Murex snail dyeing historically was done in the Mediterranean through the 11th and 12th century.  How do early Meforshim such as Rambam and Rashi’s lack of clear explanation for what the chilazon is and how the dyeing process is performed for tec...
by 613 mitzvot
Sun Feb 12, 2023 3:23 am
Forum: Science
Topic: The probability of other creatures organically dying blue
Replies: 32
Views: 7559

Re: The probability of other creatures organically dying blue

They milk the snails, applying them directly to the textile.

for reference:

https://www.atastefortravel.ca/2387-que ... sea-snail/
by 613 mitzvot
Thu Feb 09, 2023 11:16 pm
Forum: Science
Topic: The probability of other creatures organically dying blue
Replies: 32
Views: 7559

Re: The probability of other creatures organically dying blue

Yitzchok wrote:Thu Jan 01, 1970 12:00 am I remember seeing somewhere that there is an aquatic snail in the Americas that can make a blue dye. I don't know if it is chemically identical to M. Trunculus. 

 
Probably Plicopurpura pansa (aka tixinda).
by 613 mitzvot
Wed Feb 08, 2023 11:33 pm
Forum: Inyanim
Topic: Nignaz
Replies: 46
Views: 13282

Re: Nignaz

R’ Aryeh Leibowitz gave, in my opinion, a decent reply to how one could understand nignaz. https://www.youtube.com/live/ZCUtZSw4gww?feature=share Timestamp 49:53-53:38. In brief summary, he says it depends how you read nignaz, either as being completely hidden until Mashiach or unavailable to the ge...
by 613 mitzvot
Wed Feb 08, 2023 11:11 pm
Forum: Science
Topic: The probability of other creatures organically dying blue
Replies: 32
Views: 7559

Re: The probability of other creatures organically dying blue

Pliny doesn’t have a discussion for blue from the Murex, but he does talk about various kinds of purples from different shellfish in A Natural History  Book 9 Chapter 61. http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0137%3Abook%3D9%3Achapter%3D61 I wouldn’t say the Murex is ...