They killed Notre Dame de Paris!

[Ahmed]

The coloring of the flames of a printed paper varies according to the metallic components of the inks used and the heat remains modest...

[gildas]

The yellow flames due to the combustion of lead is strange because it must first start to boil, but the boiling temperature is 1°C

???? There would be no release of lead oxides (therefore a "combustion") before 1749°C, are you kidding?

A priori no:

Certainly, inhaling or ingesting lead particles can damage the nervous system, kidneys, hearts and reproductive system. To evaporate, lead must be heated to 1°C. However, the temperature of the Notre-Dame fire was around 749 ° C, so it melted. It was found melted on the vaults and will therefore be safely removed from the rubble.

https://www.francetvinfo.fr/culture/pat ... 04541.html

In any case, on the side of the prefecture, we want to be reassuring, at least in part: "The analysis of all the samples taken since the fire at Notre-Dame cathedral indicates that there is no risks related to the absorption of lead during inhalation from the outside, but confirms the presence of lead dust in the immediate vicinity of the cathedral […] All the values ​​recorded on the Île de la Cité are below the threshold regulation of 0,25 μg/m3”. No worries a priori for the air and therefore for the residents located nearby.

https://www.leparisien.fr/paris-75/ince ... 068632.php

[Ahmed]

These are two different phenomena and should not lead to the conclusion that the lead is not partly oxidized...

[sicetaitsimple]

???? There would be no release of lead oxides (therefore a "combustion") before 1749°C, are you kidding?

A priori no:

Certainly, inhaling or ingesting lead particles can damage the nervous system, kidneys, hearts and reproductive system. To evaporate, lead must be heated to 1°C. However, the temperature of the Notre-Dame fire was around 749 ° C, so it melted. It was found melted on the vaults and will therefore be safely removed from the rubble.

https://www.francetvinfo.fr/culture/pat ... 04541.html[/ Quote]

My God! Type "lead contamination notre dame" or something like that and make up your own mind.
Here is one, about two years later:
https://www.liberation.fr/environnement ... QMTEV2TJI/
If we close the square two years later, there is certainly a reason, right?
It's certainly not a disaster in terms of health, but what your francetvinfo article says (3 days after the fire) is just rubbish.

[gildas]

Was there no lead on Nantes Cathedral in 1972?

A workman's blowtorch had started an impressive fire, ravaging the entire roof. The Nantes building had remained closed for three years.

The fire in Nantes Cathedral, January 28, 1972. (Photo Loire-Atlantique Firefighters Museum / Hervio Fund.)
by Guillaume Lecaplain
published on April 16, 2019 at 16:02 p.m.
Friday, January 28, 1972, during the afternoon, a fire broke out on the roof of the Saint-Pierre-et-Saint-Paul cathedral in Nantes. The disaster was triggered accidentally by the blowtorch of a worker who was working on a roof repair site.

“The alert is received at 16:18 p.m.” by the firefighters, told Ouest-France in 2017. “At 16:19 p.m., the rescue services are triggered. At 16:20 p.m., the firefighters are on the spot. Despite the rapid arrival of the firefighters, the fire spread throughout the structure of this 1862th century building, classified as a historic building since XNUMX.


Photo Loire-Atlantique firefighters museum. Hervio Fund.
Below, the tweet of Stéphane Pajot, journalist specializing in the history of Nantes at Presse Océan.


The fire was brought under control around 21:30 p.m. The roof of Nantes Cathedral is devastated, the frame has gone up in smoke, the nave and the choir are affected. But as at Notre-Dame on April 15, the organs were not damaged. Two firefighters were slightly injured.

A temporary roof was installed and work began in 1973. The repair of the nave alone will cost "six million heavy francs", explains a curator of French buildings in this ORTF report from 1973 which takes stock of the disaster .


Nantes Cathedral remained closed to the public for three years, reopening in 1975. Following the disaster, the building was completely restored, in installments. Work on the facade lasted until 2008.

https://www.liberation.fr/france/2019/0 ... e_1721657/

[sicetaitsimple]

Was there no lead on Nantes Cathedral in 1972?

I don't know, but what does this have to do with your original statement"The yellow flames due to the combustion of lead is strange because it must first start to boil, but the boiling temperature is 1°C ", which is for me the only topic of discussion.

[gildas]

Because there was no mention of lead pollution in Nantes after the fire of 1972...

[gildas]

'Cause it's strange that lead "burns" (according to Mr Paillard) and lead oxide does not burn:
https://www.ilo.org/dyn/icsc/showcard.d ... _version=2

Emanation of toxic smoke for lead oxide however...

[sicetaitsimple]

Because there was no mention of lead pollution in Nantes after the fire of 1972...

Without speaking about the evolutions of the treatment of this type of event by the media, in 1972 all the gasolines were leaded, in other words that in a city like Nantes the content of the atmosphere and the surfaces in lead was certainly already important, not justifying no particular focus on the subject on the part of the media.
The same event is not treated in the same way 50 years apart.

[sicetaitsimple]

'Cause it's strange that lead "burns" (according to Mr Paillard) and lead oxide does not burn:

We're not going to do a chemistry lesson, but you just have to understand that lead monoxide PbO is (with a few variations) the most complete form of lead oxidation, so PbO can't burn, that there it is, it is already totally oxidized.
A bit like CO2, which is the most complete form of oxidation of the carbon atom, except that here there is an intermediate molecule, carbon monoxide CO, which is only partially oxidized and which can still burn (CO, most often the result of poor combustion, is what too often causes deaths with poorly constructed heating systems or generator-type behavior indoors).
Well, that's a very succinct explanation, but what you need to remember is that PbO can't "burn" (more exactly be oxidized) anymore.